Tootfinder

Evolutionary models for the Very Massive Stars in the R136 cluster of 30 Doradus in the Large Magellanic Cloud
Z. Keszthelyi, S. A. Brands, A. de Koter, N. Langer, J. Puls
https://arxiv.org/abs/2506.15230

Evolutionary models for the Very Massive Stars in the R136 cluster of 30 Doradus in the Large Magellanic Cloud
The cluster R136 in the LMC contains a population of stars in excess of 100 M$_\odot$, including R136a1, the most massive star known. Very Massive Stars (VMSs) play an influential role in feedback processes and may potentially produce exotic supernova types and black holes of tens of solar masses. The evolutionary history and final fate of the three most luminous stars, R136a1, R136a2, and R136a3, has been a puzzling issue. We aim to resolve this by rotating single-star MESA models. We produce …

Effects of BHF-corrected effective mass on sound speed, conformality and observables of dark matter admixed neutron stars
Arijit Das, Prashanth Jaikumar, Adarsh Karekkat, Tanumoy Mandal
https://arxiv.org/abs/2506.15328

Effects of BHF-corrected effective mass on sound speed, conformality and observables of dark matter admixed neutron stars
We construct an equation of state describing cold and dense matter in the core of neutron stars which includes an admixture of fermionic dark matter and incorporates nucleon effective masses derived from the relativistic Brueckner-Hartree-Fock (BHF) many-body approach within a relativistic mean-field model. Such a BHF-informed mixed-model approach increases stellar compactness, with mass-radius configurations which are consistent with smaller, lighter pulsars. The model displays the expected no…

SoftBank-backed Spotter, which fronts cash to YouTubers for a cut of revenue, is facing significant challenges due to YouTube's shift toward Shorts, and more (Aisha Counts/Bloomberg)
https://www.bloomberg.com/news/articles/20

Distances of Supernova Remnants Associated with Neutron Stars in the Galaxy
Xiaohan Chen, Shu Wang, Xiaodian Chen
https://arxiv.org/abs/2506.15460 https://…

Distances of Supernova Remnants Associated with Neutron Stars in the Galaxy
Accurate distance measurements to supernova remnants (SNRs) are essential for determining their physical parameters, such as size, age, explosion energy, and for constraining the properties of associated neutron stars (NSs). We present an extinction--distance method that combines precise Gaia DR3 photometry, parallax, and stellar parameters from the SHBoost catalog to homogeneously construct extinction--distance profiles for 44 NS-associated Galactic SNRs. Applying a statistical model, we ident…

They've got the Stars & Stripes hung upside down. Is that synth in distress? #TOTP

Astronomical Cardiology: A Search For Heartbeat Stars Using $\textit{Gaia}$ and $\textit{TESS}$
Jowen Callahan, D. M. Rowan, C. S. Kochanek, K. Z. Stanek
https://arxiv.org/abs/2506.14869

Astronomical Cardiology: A Search For Heartbeat Stars Using $\textit{Gaia}$ and $\textit{TESS}$
Heartbeat stars are a subclass of binary stars with short periods, high eccentricities, and phase-folded light curves that resemble an electrocardiogram. We start from the $\textit{Gaia}$ catalogs of spectroscopic binaries and use $\textit{TESS}$ photometry to identify 112 new heartbeat star systems. We fit their phase-folded light curves with an analytic model to measure their orbital periods, eccentricities, inclinations, and arguments of periastron. We then compare these orbital parameters t…

Massive stars exploding in a He-rich circumstellar medium. XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc and 2024aej
Z. -Y. Wang, A. Pastorello, Y. -Z. Cai, M. Fraser, A. Reguitti, W. -L. Lin, L. Tartaglia, D. Andrew Howell, S. Benetti, E. Cappellaro, Z. -H. Chen, N. Elias-Rosa, J. Farah, A. Fiore, D. Hiramatsu, E. Kankare, Z. -T. Li, P. Lundqvist, P. A. Mazzali, C. McCully, J. Mo, S. Moran, M. Newsome, E. Padilla Gonzalez, C. Pellegrino, Z. -H. Peng, S. J. S…

Massive stars exploding in a He-rich circumstellar medium. XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc and 2024aej
We present the photometric and spectroscopic analysis of five Type Ibn supernovae (SNe): SN 2020nxt, SN 2020taz, SN 2021bbv, SN 2023utc, and SN 2024aej. These events share key observational features and belong to a family of objects similar to the prototypical Type Ibn SN 2006jc. The SNe exhibit rise times of approximately 10 days and peak absolute magnitudes ranging from $-$16.5 to $-$19 mag. Notably, SN 2023utc is the faintest Type Ibn supernova discovered to date, with an exceptionally low r…

SoftBank-backed Spotter, which fronts cash to YouTubers for a cut of revenue, is facing significant challenges due to YouTube's shift toward Shorts, and more (Aisha Counts/Bloomberg)
https://www.bloomberg.com/news/articles/20

Bogong moths use a stellar compass for long-distance navigation at night: #moth makes its epic migration navigating by starlight: https://www.science.org/content/article/moth-makes-its-epic-migration-navigating-starlight - Bogong moths fly 1000 kilometers orienting to stars and the Milky Way, an ability never seen before in invertebrates.

About 90 minutes after sunset, look for red Mars shining next to the similarly bright Regulus, one of our brightest stars. Regulus, a member of the Leo constellation, is actually a quadruple star system composed of four stars organized into two pairs.
#stars #Heavens

Cowboys Boost Offense With Versatile Trio: Luepke, Turpin, Blue https://insidethestar.com/cowboys-boost-offense-with-versatile-trio-luepke-turpin-blue

Topological Stars and scalar wave equation: Exact resummation of the renormalized angular momentum in the eikonal limit
Donato Bini, Giorgio Di Russo
https://arxiv.org/abs/2506.14442

Topological Stars and scalar wave equation: Exact resummation of the renormalized angular momentum in the eikonal limit
We show that for a Topological Star the renormalized angular momentum parameter, $ν$, appearing in the Mano-Suzuki-Takasugi-type or in the quantum-Seiberg-Witten-type approaches of the perturbation equations, has 1) a direct link with the geodesic radial action computed along the null orbits of the background and 2) admits an exact resummation in terms of hypergeometric functions, generalizing previous results valid in the Schwarzschild case, see Ref.[arXiv:2504.07862 [hep-th]].

I... got scammed.
By https://firstpressgames.com .
I wanted to buy a birthday present, and I didn't expect this company to be so problematic.
One month later without getting anything from them, nor responses to my messages... and it crosses my mind that I should have checked online reviews for that e-commerce business before buying anything... and there you go: 1.4 stars out of 5 (no one gave more than 2 stars).
The few reviews that gave 2 stars are something like this, YEARS of delay: https://gamepad.club/@vny/110691909210001220
All of the public reviews use the word scam in one or another language, no exceptions.
Then I checked their social accounts, and... of course, they blocked comments everywhere, to avoid the possibility of angry people popping up and pointing to their shady behavior.

Black Hole - Neutron Star and Binary Neutron Star Mergers from Population III and II stars
Benedetta Mestichelli, Michela Mapelli, Filippo Santoliquido, Manuel Arca Sedda, Marica Branchesi, Lavinia Paiella, Guglielmo Costa, Giuliano Iorio, Matthew Mould, Veronika Lipatova, Boyuan Liu, Ralf S. Klessen
https://arxiv.org/abs/2506.1…

Black Hole - Neutron Star and Binary Neutron Star Mergers from Population III and II stars
Population III (Pop.$~$III) stars are expected to be massive and to undergo minimal mass loss due to their lack of metals, making them ideal progenitors of black holes and neutron stars. Here, we investigate the formation and properties of binary neutron star (BNS) and black hole-neutron star (BHNS) mergers originating from Pop.$~$III stars, and compare them to their metal-enriched Population II (Pop.$~$II) counterparts, focusing on their merger rate densities (MRDs), primary masses and delay t…

For a few weeks now, we've had two new stars in our household. The two #rabbits Hoppel and Idefix now inhabit the old chicken coop including the outdoor area. So fluffy!

Testing the asteroseismic estimates of stellar radii with surface brightness-colour relations and {\it Gaia} DR3 parallaxes. III. Main-sequence stars
G. Valle, M. Dell'Omodarme, P. G. Prada Moroni, S. Degl'Innocenti
https://arxiv.org/abs/2506.15462

Testing the asteroseismic estimates of stellar radii with surface brightness-colour relations and {\it Gaia} DR3 parallaxes. III. Main-sequence stars
We compare the radii derived from the asteroseismic scaling relations with those from surface brightness-colour relations (SBCRs) combined with the Gaia DR3 parallaxes for main-sequence (MS) stars. The atmospheric and asteroseismic parameters were sourced from the recently released KEYSTONE catalogue and matched to Gaia DR3 and TESS Input Catalog v8.2. We computed SBCR-based radii using two different SBCRs, and estimated their relative differences with respect to radius estimates from asterosei…

So as @… pointed out, "Sneaky way to include the Russian flag in your official messaging." 🤔
#USpol #dod

This could be great!
Cartoon Network Studios is expanding the beloved “Steven Universe” franchise with a brand-new series, “Steven Universe: Lars of the Stars,” now in development for Prime Video.
https://variety.com/2025/tv/global/ste

Interaction of Trappist-1 exoplanets with coronal mass ejections: Joule heating, Poynting fluxes and the role of magnetic fields
Filip Elekes, Joachim Saur, Alexander Grayver
https://arxiv.org/abs/2506.15243

Interaction of Trappist-1 exoplanets with coronal mass ejections: Joule heating, Poynting fluxes and the role of magnetic fields
Flares and associated Coronal Mass Ejections (CMEs) are energetic stellar phenomena that shape the space weather around planets. Close-in exoplanets orbiting active cool stars are likely exposed to extreme space weather whose effects on the planets are not understood well enough. The terrestrial Trappist-1 exoplanets are excellent targets to study the impact of CMEs on close-in planets and their atmospheres. We study the role of planetary magnetic fields in shielding the planet from external fo…

Drag stars are set to attend, then protest, Trump’s appearance at Les Miserables | The Independent
https://www.independent.co.uk/news/world/americas/drag-stars-plan-trump-protest-les-miserables-b2768391.html

Conditional central limit theorems for exponential random graphs
Xiao Fang, Song-Hao Liu, Zhonggen Su, Xiaolin Wang
https://arxiv.org/abs/2506.15159 https:…

Conditional central limit theorems for exponential random graphs
In this paper, we study the Exponential Random Graph Models (ERGMs) conditioning on the number of edges. In subcritical region of model parameters, we prove a conditional Central Limit Theorem (CLT) with explicit mean and variance for the number of two stars. This generalizes the corresponding result in the literature for the Erdős--Rényi random graph. To prove our main result, we develop a new conditional CLT via exchangeable pairs based on the ideas of Dey and Terlov. Our key technical cont…

Supernova explosions of runaway stars and young neutron stars above the Galactic plane
Vinka Daki\'c, Sergei B. Popov, Roberto Turolla
https://arxiv.org/abs/2506.13660

Supernova explosions of runaway stars and young neutron stars above the Galactic plane
Several supernova remnants and young neutron stars were recently discovered relatively high above the Galactic plane. One possibility is that they originate from runaway OB stars born in the Galactic disk. Understanding their origin will provide key insights into the properties of the Galactic halo. This paper aims to determine the spatial distribution of supernova explosions from runaway OB stars and to assess whether this model can explain certain observed neutron stars. We map the distributi…

Chemical Signatures of Population III Stars in Damped Lyman-$\alpha$ Absorption Systems at $z \approx 6$
Eli Visbal, Greg L. Bryan, Zoltan Haiman
https://arxiv.org/abs/2506.14482 …

Chemical Signatures of Population III Stars in Damped Lyman-$α$ Absorption Systems at $z \approx 6$
Recently, Sodini et al. (2024) presented a sample of OI damped Lyman-$α$ absorption system (DLA) analogs at $z\sim6$ that contain possible chemical signatures of Population III (Pop III) stars. In this paper, we use an N-body simulation-based semi-analytic model of the first stars and galaxies to predict the impact of Pop III stars on high-redshift DLAs. These Pop III DLA predictions are the first to include a number of important physical effects such as Lyman-Werner (LW) feedback, reionizatio…

Cowboys stars Micah Parsons, Trevon Diggs arrive at team facility, expected to attend minicamp

https://www.cbssports.com/nfl/news/cowboys

Bayesian Quantification of Observability and Equation of State of Twin Stars
Xavier Grundler, Bao-An Li
https://arxiv.org/abs/2506.13677 https://

Bayesian Quantification of Observability and Equation of State of Twin Stars
The possibility of discovering twin stars, two neutron stars (NSs) with the same mass but different radii, is usually studied in forward modelings by using a restricted number of NS matter equation of state (EOS) encapsulating a first-order phase transition from hadronic to quark matter (QM). Informing our likelihood function with the NS radius data from GW170817 and using a meta-model with 9-parameters capable of mimicking most NS EOSs available in the literature, we conduct a Bayesian quantif…

Meet Kleine Powell: Star of Dallas Cowboys Cheerleader Netflix doc https://www.si.com/nfl/cowboys/news/kleine-powell-dallas-cowboys-cheerleader-netflix-docuseries-photos-bio

Telescopes on the Andes glimpse elusive encounters fueled by the very first stars in the universe more than 13 billion years ago by detecting cosmic microwave light signals https://www.404media.co/humans-have-now-seen-the-dawn-of-time-from-ear…

Humans Have Now Seen the Dawn of Time from Earth After Breakthrough
Telescopes perched on the Andes Mountains glimpsed elusive encounters fueled by the first of the first stars in the universe more than 13 billion years ago.

Superradiant amplification by rotating viscous compact objects
Jaime Redondo-Yuste, Vitor Cardoso
https://arxiv.org/abs/2506.13850 https://

Superradiant amplification by rotating viscous compact objects
We study fluctuations of rotating viscous stars, using the causal relativistic hydrodynamics of Bemfica, Disconzi, Kovtun, and Noronha. We derive, in a slow-rotation approximation, a coupled system of equations describing the propagation of axial gravitational waves through the star, which couple to internal viscous modes. We show that rotating viscous stars amplify incoming low-frequency gravitational waves, a phenomenon which we argue to be universal. Superradiant amplification does not seem …

The ejection and detectability of high- and hyper-velocity stars by compact object binaries in globular clusters
Fraser A. Evans, Steffani M. Grondin, Claire S. Ye, Jeremy Webb, Jo Bovy
https://arxiv.org/abs/2506.14273

The ejection and detectability of high- and hyper-velocity stars by compact object binaries in globular clusters
The dense cores of Milky Way globular clusters (GCs) play host to a variety of dynamical encounters between stellar objects, which can accelerate stars to velocities high enough to escape the GC. The most extreme examples of these encounters are interactions between single GC stars and binaries including at least one compact object. These interactions can result in ejection velocities of up to several hundred $\mathrm{km \ s^{-1}}$, approaching or even exceeding the escape velocity of the Galax…

Polycyclic Aromatic Hydrocarbons in the circumstellar medium of Herbig Ae/Be stars
R. Arun, Blesson Mathew, B. Shridharan, K. Ujjwal, Akhil Krishna R, G. Maheswar, Sreeja S. Kartha
https://arxiv.org/abs/2506.14218

Polycyclic Aromatic Hydrocarbons in the circumstellar medium of Herbig Ae/Be stars
We present a comprehensive mid-infrared spectroscopic survey of 124 Herbig Ae/Be stars using newly processed Spitzer/IRS spectra from the newly released CASSISjuice database. Based on prominent dust and molecular signatures (polycyclic aromatic hydrocarbons, silicates, and hydrogenated amorphous carbons), we classify the stars into five groups. Our analysis reveals that 64% of the spectra show PAH emission, with detections peaking in the stellar effective temperature range 7000-11000 K (B9-A5).…

🇺🇦 #NowPlaying on #BBC6Music's #LaurenLaverne
Turnstile:
🎵 SEEIN' STARS
#Turnstile
https://open.spotify.com/track/0vbdCsYHg1by09QKOGO4PR

New lens flare collection just dropped. https://mastodon.bot/@apod/114663574093410846

🇺🇦 #NowPlaying on KEXP's #DriveTime
Turnstile:
🎵 SEEIN’ STARS
#Turnstile
https://turnstilehardcore.bandcamp.com/track/seein-stars
https://open.spotify.com/track/0vbdCsYHg1by09QKOGO4PR

QCD Axion Conversion in Magnetospheres of Neutron Stars
Shubham Yadav
https://arxiv.org/abs/2506.13310 https://arxiv.org/pdf/2506.133…

QCD Axion Conversion in Magnetospheres of Neutron Stars
The axion-converted-photons flux is a principal window for searching QCD axions as a dark matter (DM) candidate. In addition to solving the strong CP problem, these may explain the properties of the mysterious DM. Neutron star (NS) cooling by neutrino/axion emissions rate constrains the astrophysical properties of superdense matter. We attempt to analyse the impact of strong magnetic fields on the emission properties of NS by employing the FPS equation of State (EoS). We use the Tolman Oppenhei…

StARS DCM: A Sleep Stage-Decoding Forehead EEG Patch for Real-time Modulation of Sleep Physiology
William G. Coon, Preston Peranich, Griffin Milsap
https://arxiv.org/abs/2506.03442

StARS DCM: A Sleep Stage-Decoding Forehead EEG Patch for Real-time Modulation of Sleep Physiology
The System to Augment Restorative Sleep (StARS) is a modular hardware/software platform designed for real-time sleep monitoring and intervention. Utilizing the compact DCM biosignal device, StARS captures electrophysiological signals (EEG, EMG, EOG) and synchronizes sensor data using the ezmsg real-time software framework. StARS supports interventions such as closed-loop auditory stimulation and dynamic thermal modulation guided by sleep-stage decoding via advanced neural network models and tra…

Near-Eddington mass loss of hydrogen-rich Wolf-Rayet stars
Roel R. Lefever, Andreas A. C. Sander, Matheus Bernini-Peron, Gemma Gonz\'alez-Tor\`a, Nicolas M. Moens, Francisco Najarro, Elisa C. Sch\"osser, Gautham N. Sabhahit, Jorick S. Vink
https://arxiv.org/abs/2506.13582

Near-Eddington mass loss of hydrogen-rich Wolf-Rayet stars
Context. Very massive clusters and regions of intense star formation such as the center of our Milky Way contain young, hydrogen-burning stars very close to the Eddington Limit. Formally classified as hydrogen-rich Wolf-Rayet stars, the winds and spectra of these stars are distinctively different to the more evolved, classical Wolf-Rayet (cWR) stars. Results. We find an overall downward trend of the mass-loss rate with increasing temperature and decreasing metallicity. However, at SMC metallici…

Hey Tenno, if you feel the weight of the Orokin legacy, boost this to spread the word across the Fediverse! If you enjoy Warframe and love the Fediverse, check out:
- https://video.sidh.bzh/c/warframe/videos
- @…

Two AFC North stars skipping mandatory minicamp, plus full Aaron Rodgers contract details

https://www.cbssports.com/nfl/news/two-afc

Reflections on Tech, Faith, and Justice
This week, I'm talking about yet another Christian-famous person falling from grace. Plus a sad court case, and a few other bits.
https://www.bobmuellerwriter.com/reflections-on-tech-faith-and-justice/

Reflections on Tech, Faith, and Justice – Bob Mueller
DIY wins, tech fixes, Disney stars in space, faith deconstruction, and justice in CCM—this week had it all.

ChronoFlow - a Data-driven Model for #Gyrochronology: https://iopscience.iop.org/article/10.3847/1538-4357/adcd73 -> U of T Astronomers Pioneer Innovative Machine Learning Model to Determine the Ages of Stars: https://www.dunlap.utoronto.ca/u-of-t-astronomers-pioneer-innovative-machine-learning-model-to-determine-the-ages-of-stars/

No influence of passing stars on paleoclimate reconstructions over the past 56 million years
Richard E. Zeebe, David M. Hernandez
https://arxiv.org/abs/2506.10158

No influence of passing stars on paleoclimate reconstructions over the past 56 million years
Passing stars (also called stellar flybys) have notable effects on the solar system's long-term dynamical evolution, injection of Oort cloud comets into the solar system, properties of trans-Neptunian objects, and more. Based on a simplified solar system model, omitting the Moon and the Sun's quadrupole moment J2, it has recently been suggested that passing stars are also an important driver of paleoclimate before ~50 Myr ago, including a climate event called the Paleocene-Eocene Thermal Maximu…

Gravitational Scattering of Two Neutron Stars
Joan Fontbut\'e, Sebastiano Bernuzzi, Piero Rettegno, Simone Albanesi, Wolfgang Tichy
https://arxiv.org/abs/2506.11204

Gravitational Scattering of Two Neutron Stars
We present the first numerical relativity simulations of the gravitational scattering of two neutron stars. Constraint-satisfying initial data for two equal-mass non-spinning sequences are constructed at fixed energy and various initial angular momenta (impact parameter) and evolved with Einstein equations through the scattering process. The strong-field scattering dynamics are explored up to scattering angles of $225^\circ$ and the threshold of dynamical captures. The transition to bound orbit…

A solution to the tension of burning on neutron stars and nuclear physics
Y. Cavecchi, D. Galloway, A. Heger, P. Santill\'An-Ortega, M. Nava-Callejas, F. M. Vincentelli, L. Rivera Sandoval, A. Goodwin, Z. Johnston, S. Puente Mancilla, D. Page
https://arxiv.org/abs/2506.11966

A solution to the tension of burning on neutron stars and nuclear physics
When neutron stars accrete matter from a companion star, this matter forms a disc around them and eventually falls on their surface. Here, the fuel can ignite into bright flashes called Type I bursts. Theoretical calculations based on state-of-the-art nuclear reactions are able to explain many features of the bursts. However, models predict that the bursts should cease at high accretion rates, whereas in many sources they disappear at much lower rates. Moreover, their recurrence times also show…

Seattle area: Man charged with targeting MLB and NFL stars in home burglary spree | The Independent
https://www.the-independent.com/news/world/americas/crime/nfl-mlb-stars-burglarly-arrest-seattle-b2765736.html

Cowboys stars Micah Parsons, Trevon Diggs work out together before minicamp https://www.si.com/nfl/cowboys/news/dallas-cowboys-stars-micah-parsons-trevon-diggs-work-out-together-before-minicamp

The Nearby Evolved Stars Survey (NESS) V: properties of volume-limited samples of Galactic evolved stars
I. McDonald, S. Srinivasan, P. Scicluna, O. C. Jones, A. A. Zijlstra, S. H. J. Wallstr\"om, T. Danilovich, J. H. He, J. P. Marshall, J. Th. van Loon, R. Wesson, F. Kemper, A. Trejo-Cruz, J. Greaves, T. Dharmawardena, J. Cami, H. Kim, K. E. Kraemer, C. J. R. Clark, H. Shinnaga, C. Haswell, H. Imai, J. G. A. Wouterloot, A. J. P\'erez Vidal, G. Rau, the NESS collaboration

The Nearby Evolved Stars Survey (NESS) V: properties of volume-limited samples of Galactic evolved stars
We provide a meta-study of the statistical and individual properties of two volume-complete sets of evolved stars in the Solar Neighbourhood: (1) 852 stars from the Nearby Evolved Stars Survey (NESS), and (2) a partially overlapping set of 507 evolved stars within 300 pc. We also investigate distance determinations to these stars, their luminosity functions and their spatial distribution. Gaia APSIS GSP-Phot AENEAS temperatures of bright giant stars often appear to be underestimated. Existing l…

Gapless neutron superfluidity in the crust of the accreting neutron stars KS 1731-260 and MXB 1659-29
Valentin Allard, Nicolas Chamel
https://arxiv.org/abs/2506.11693

Gapless neutron superfluidity in the crust of the accreting neutron stars KS 1731-260 and MXB 1659-29
The interpretation of the thermal evolution of the transiently accreting neutron stars MXB 1659-29 and KS 1731-260 after an outburst is challenging, both within the traditional deep-crustal heating paradigm and the thermodynamically consistent approach of Gusakov and Chugunov that accounts for neutron diffusion throughout the crust. All these studies assume that the neutron superfluid in the crust is at rest. However, we have recently shown that a finite superflow could exist and could lead to …

The most energetic transients - tidal disruptions of high-mass stars: #ExtremeNuclearTransients (ENTs) are the most energetic transients yet observed.

🇺🇦 #NowPlaying on KEXP's #DriveTime
Stars:
🎵 Hold On When You Get Love and Let Go When You Give It
#Stars
https://starsband.bandcamp.com/track/hold-on-when-you-get-love-and-let-go-when-you-give-it-2
https://open.spotify.com/track/3QF9b4PhQnTChD08dJruWN

Tracing the Milky Way: Calibrating chemical ages with high-precision Kepler data
G. Casali, J. Montalb\`an, A. Miglio, L. Casagrande, L. Magrini, C. Chiappini, A. Bragaglia, M. Matteuzzi, K. Brogaard, A. Stokholm, V. Grisoni, M. Tailo, E. Willett
https://arxiv.org/abs/2506.15546

Tracing the Milky Way: Calibrating chemical ages with high-precision Kepler data
Chemical clocks offer a powerful tool for estimating stellar ages from spectroscopic surveys. We present a new detailed spectroscopic analysis of 68 Kepler red giant stars to provide a suite of high-precision abundances along with asteroseismic ages with better than 10 percent precision from individual mode frequencies. We obtained several chemical clocks as ratios between s-process elements (Y, Zr, Ba, La, Ce) and alpha-elements (Mg, Ca, Si, Al, Ti). Our data show that [Ce/Mg] and [Zr/Ti] disp…

Potential NFC under-the-radar stars in 2025: One player from each team who could make a surprising impact

https://www.cbssports.com/nfl/news/pote…

The WNBA and E.W. Scripps renew their media rights deal, ensuring Friday night WNBA matchups will continue on Ion, along with a new weekly studio show (CNBC)
https://www.cnbc.com/2025/06/13/wnba-scripps-media-rights-deal.html

WNBA renews media rights deal with Scripps
The new agreement comes after Ion has seen huge growth with the WNBA and as the league gains in popularity thanks to stars like Caitlin Clark and Angel Reese.

Yet another Christian-famous person falls from their pedestal. Plus, a Michigan court case where no one wins.
https://www.bobmuellerwriter.com/reflections-on-tech-faith-and-justice/

Reflections on Tech, Faith, and Justice – Bob Mueller
DIY wins, tech fixes, Disney stars in space, faith deconstruction, and justice in CCM—this week had it all.

Cowboys cheerleaders jump for joy in iconic uniforms for Netflix return https://www.sportingnews.com/us/culture/entertainment/news/dallas-cowboys-cheerleaders-jum…

Chemical Abundances in the Metal-Poor Globular Cluster ESO 280-SC06: A Formerly Massive, Tidally Disrupted Globular Cluster
Sam A. Usman, Alexander P. Ji, Jandrie Rodriguez, Jeffrey D. Simpson, Sarah L. Martell, Ting S. Li, Ana Bonaca, Shivani Shah, Madeleine McKenzie
https://arxiv.org/abs/2506.15664

Chemical Abundances in the Metal-Poor Globular Cluster ESO 280-SC06: A Formerly Massive, Tidally Disrupted Globular Cluster
We present the first high-resolution abundance study of ESO 280-SC06, one of the least luminous and most metal-poor gravitationally bound Milky Way globular clusters. Using Magellan/MIKE spectroscopy for ten stars, we confirm the cluster's low metallicity as [Fe/H] = $-2.54 \pm 0.06$ and the presence of a nitrogen-enhanced star enriched by binary mass transfer. We determine abundances or abundance upper limits for 21 additional elements from the light, alpha, odd-Z, iron peak, and neutron-captu…

Enhanced magnetic activity in rapidly rotating #binary stars: https://arxiv.org/abs/2505.19967 -> Pairs of stars that orbit each other exhibit unexpected magnetic activity: https://science.anu.edu.au/news-events/news/pairs-stars-orbit-each-other-exhibit-unexpected-magnetic-activity

Unlocking the mystery of Sr synthesis in the early Galaxy through analysis of barium isotopes in very metal-poor stars
T. M. Sitnova, L. Lombardo, L. I. Mashonkina, F. Rizzuti, G. Cescutti, C. J. Hansen, P. Bonifacio, E. Caffau, A. Koch-Hansen, G. Meynet, R. Fernandes de Melo
https://arxiv.org/abs/2506.10193

Unlocking the mystery of Sr synthesis in the early Galaxy through analysis of barium isotopes in very metal-poor stars
We determine the contributions of the rapid (r) and slow (s) neutron capture processes to the Ba isotope mixture, along with Ba, Eu, and Sr NLTE abundances, in a sample of very metal-poor stars. The selected stars formed before the contribution from the main s-process in low- and intermediate-mass stars became significant. Some of our sample stars are enhanced in Sr, with [Sr/Ba] reaching up to 0.7. These stars gained their high Sr abundance from a poorly understood process, which may appear to…

Axisymmetric Cooling of Neutron Stars with Strong Magnetic Fields
Rodrigo Negreiros, Jeffrey Peterson, Veronica Dexheimer
https://arxiv.org/abs/2506.09841 …

Axisymmetric Cooling of Neutron Stars with Strong Magnetic Fields
We study the cooling evolution of neutron stars with strong poloidal magnetic fields (with strength not far from observed values) using the full general relativity 2-dimensional \textit{Astreus} code, which solves consistently Einstein's and Maxwell's equations. We find that central magnetic fields with strengths $3-4\times10^{17}$ G, corresponding to surface magnetic fields $7-8\times10^{16}$, can significantly modify the cooling behavior of neutron stars, leading to stars with similar masses …

🇺🇦 #NowPlaying on KEXP's #PacificNotions
Max Richter:
🎵 Dream 11 / Moth-Like Stars (Pt. 2)
#MaxRichter
https://open.spotify.com/track/2v9xJPaGjV6CkkBm7Xsu2Z

Potential AFC under-the-radar stars in 2025: One player from each team who could make a surprising impact

https://www.cbssports.com/nfl/news/pote…

Counterculture Stars: Slow and Retrograde Stars with Low-Alpha Disk Abundances
Carrie Filion, Michael S. Petersen, Danny Horta, Kathryne J. Daniel, Madeline Lucey, Adrian M. Price-Whelan
https://arxiv.org/abs/2506.09927

Counterculture Stars: Slow and Retrograde Stars with Low-Alpha Disk Abundances
The Milky Way is home to a thin disk that can be defined via kinematics and/or elemental abundances. The elemental abundance-defined thin disk, also called the low-alpha disk, is generally thought to be comprised of stars on planar, circular orbits that approximate the circular velocity curve. While this is an apt description for the majority of stars with thin-disk-like abundances, there are a number of interesting exceptions. In this analysis, we identify and investigate $\sim 70$ stars with …

Indiana All-Stars boys basketball history: Year-by-year rosters https://www.indystar.com/story/sports/high-school/2025/06/04/indiana-all-stars-boys-basketball-history-year-…

Neutron Star Radial Perturbations for Causal, Viscous, Relativistic Fluids
Daniel A. Caballero, Nicol\'as Yunes
https://arxiv.org/abs/2506.09149 https:…

Neutron Star Radial Perturbations for Causal, Viscous, Relativistic Fluids
Which of the multiple models of causal and stable relativistic viscous fluids that have been developed is best suited to describe neutron stars? The modeling of out-of-equilibrium effects in these relativistic, astrophysical objects must be one with care, as simple Newtonian intuition fails to remain causal. Radial stability of neutron stars is one of the primary conditions for the viability of such out-of-equilibrium models. In this paper, we study radial perturbations of neutron stars for the…

Aaron Donald challenges Jared Verse to 'old man workout' as Rams stars exchange playful jabs

https://www.cbssports.com/nfl/news/aaron-d

ODIN - Star Formation Histories Reveal Formative #Starbursts Experienced by Lyα-emitting Galaxies at Cosmic Noon: https://iopscience.iop.org/article/10.3847/2041-8213/adbf8c -> Looking Deeply Into the Universe’s Past, Scientists Detect Bursts of New Stars: https://www.rutgers.edu/news/looking-deeply-universes-past-scientists-detect-bursts-new-stars - prodigious star formation by special galaxies reveals the Milky Way’s origin story.

Stellar Velocity Dispersion versus Age: Consistency across Observations and Simulations, with the Milky Way as an Outlier
Fiona McCluskey, Andrew Wetzel, Sarah Loebman, Jorge Moreno
https://arxiv.org/abs/2506.11840

Stellar Velocity Dispersion versus Age: Consistency across Observations and Simulations, with the Milky Way as an Outlier
Within disk galaxies, the velocity dispersion, $σ$, of stars increases with age, $τ$, as measured in the Milky Way (MW) and nearby galaxies. This relation provides a key window into galactic formation history, tracing both the kinematics of stars at birth and the dynamical heating of stars after birth. We compile and compare observational measurements of the MW, M31, M33, and 16 galaxies from the PHANGS survey. The MW exhibits significantly colder stellar kinematics, with 2-3 times lower $σ(…

The efficiency of mixed modes for angular momentum transport
Beatriz Bordad\'agua, Felix Ahlborn, Quentin Copp\'ee, Jo\~ao P. Marques, K\'evin Belkacem, Saskia Hekker
https://arxiv.org/abs/2506.13283

The efficiency of mixed modes for angular momentum transport
Core rotation rates of red-giant stars inferred from asteroseismic observations are substantially lower than predicted by current stellar models. This indicates the lack of an efficient angular momentum transport mechanism in radiative interiors. Mixed pressure-gravity modes are a promising candidate to extract angular momentum from the core of red giants. We focus on determining the effect of mixed modes on the rotation rates of stars evolving along the red giant branch (RGB). We developed a p…

New Field OB and OBe Binaries of the SMC Wing: Observational Properties and Population Modeling
Irene Vargas-Salazar, M. S. Oey, Jan J. Eldridge, Drew Weisserman, Helen C. Januszewski, Juliette C. Becker, Stefano Zazzera, Norberto Castro, Yongjung Kim, Kaitlin M. Kratter, Mario Mateo, John I. Bailey III
https://arxiv.org/abs/250…

New Field OB and OBe Binaries of the SMC Wing: Observational Properties and Population Modeling
We present a radial velocity (RV) survey of the field OB and OBe stars of the SMC Wing. We use multi-epoch observations of 55 targets obtained with the Magellan IMACS and M2FS multi-object spectrographs to identify single- and double-lined spectroscopic binaries. We also use TESS light curves to identify new eclipsing binary candidates. We find that 10 each of our 34 OB (29\%) and 21 OBe (48\%) stars are confirmed binaries, and at least $\sim$ 6 more are candidates. Using our RV measurements, w…

Microphysical Origins of Gravitational Potentials in Astrophysical Systems
Meir Shimon
https://arxiv.org/abs/2506.13528 https://arxiv…

Microphysical Origins of Gravitational Potentials in Astrophysical Systems
Most astrophysical systems (except for very compact objects such as, e.g., black holes and neutron stars) in our universe are characterized by shallow gravitational potentials, with dimensionless compactness parameter. While the existence and characteristic scales of such virialized systems depend on gravity, we demonstrate that the value of the compactness -- and thus the non-relativistic nature of most astrophysical objects -- arises from microphysical parameters, specifically the fine struct…

Myth or reality? Examining the 'Madden curse' through the past 10 cover stars https://www.espn.com/gaming/story/_/id/43741048/madden-curse-fact-fiction-10-years-cover-stars

Revealing Dark Matter's Role in Neutron Stars Anisotropy: A Bayesian Approach Using Multi-messenger Observations
Xue-Zhi Liu, Premachand Mahapatra, Chun Huang, Ayush Hazarika, Chiranjeeb Singha, Prasanta Kumar Das
https://arxiv.org/abs/2506.08376

Revealing Dark Matter's Role in Neutron Stars Anisotropy: A Bayesian Approach Using Multi-messenger Observations
Dark matter (DM) continues to evade direct detection, but neutron stars (NSs) serve as natural laboratories where even a modest DM component can alter their structure. While many studies have examined DM effects on NSs, they often rely on specific choices of equations of state (EOS) models, assume isotropy, and lack a Bayesian statistical framework, limiting their predictive power. In this work, we present a Bayesian framework that couples pressure-anisotropic nuclear EOS to a self-interacting …

Main-sequence Turnoff Stars as Probes of the Ancient Galactic Relic: Chemo-dynamical Analysis of a Pilot Sample
Renjing Xie, Haining Li, Ruizhi Zhang, Yin Wu, Xiang-Xiang Xue, Gang Zhao, Shi-Lin Zhang, Xiao-Jin Xie
https://arxiv.org/abs/2506.07758

Main-sequence Turnoff Stars as Probes of the Ancient Galactic Relic: Chemo-dynamical Analysis of a Pilot Sample
The main-sequence turnoff (MSTO) stars well preserve the chemical properties where they were born, making them ideal tracers for studying the stellar population. We perform a detailed chemo-dynamical analysis on moderately metal-poor ($-2.0<\mathrm{[Fe/H]}<-1.0$) MSTO stars to explore the early accretion history of the Milky Way. Our sample includes four stars observed with high-resolution spectroscopy using CFHT/ESPaDOnS and 163 nearby MSTO stars selected from the SAGA database with high-resol…

Cowboys' Klayton Adams spotted in epic Step Brothers shirt with team's stars https://www.si.com/nfl/cowboys/news/dallas-cowboys-oc-klayton-adams-spotted-epic-step-brothers-shirt

In the final talk of the morning sessions of the #SolarEclipse Conference Thoby Dittrich talked about the Modern Eddington Experiment (the website https://moderneddingtonexperiment.org is under heavy construction): the best observing result of gravitational deflection of starlight by the Sun in the optical during solar eclipses is still Brun's from 2017 - https://arxiv.org/abs/1802.00343 - while others have tried with a vengeance since. The goal remains to observe the significant deflection of star positions between 1 and 2 solar radii from the center of the Sun: this is known as the 'forbidden zone' because the corona can be very bright here and only bright stars can be measured reliably - but those in turn are rare. It turns out that the star fields around the totally eclipsed Sun in 2027 and 2028 will be unusually rich in good candidates so there is (or should be) considerable interest in the physics didactics community to make use of these eclipses in southern Spain / northern Africa and Australia, respectively. 4/n

Rotational Variables: Kepler Versus ASAS-SN
Jack Stethem (Department of Astronomy, The Ohio State University), Christopher S. Kochanek (Department of Astronomy, The Ohio State University, Center for Cosmology and AstroParticle Physics, The Ohio State University), Anya Phillips (Center for Astrophysics - Harvard and Smithsonian), Lyra Cao (Department of Physics and Astronomy, Vanderbilt University), Marc Pinsonneault (Department of Astronomy, The Ohio State University, Center for Cosmol…

Rotational Variables: Kepler Versus ASAS-SN
Rotational variables are stars that vary in brightness due to star spots modulated by rotation. They are probes of stellar magnetism, binarity, and evolution. Phillips et al. (2023) explored distinct populations of ~50,000 high-amplitude rotational variables from the All-Sky Automated Survey for Supernovae (ASAS-SN), examining correlations between stellar rotation, binarity, and activity. Here, we carry out a similar analysis of ~50,000 much lower amplitude Kepler rotational variables. The Kepl…

Cardinals' Trey McBride wants TE market to continuously be reset: Examining next stars who could cash in

https://www.cbssports.com/nfl/news/car…

AstroSat/UVIT Study of NGC 663: first detection of Be sdOB systems in a young star cluster
Sneha Nedhath, Sharmila Rani, Annapurni Subramaniam, Elena Pancino
https://arxiv.org/abs/2506.08126

AstroSat/UVIT Study of NGC 663: first detection of Be+sdOB systems in a young star cluster
Context. Be stars are rapidly rotating stars surrounded by a disc; however, the origin of these remains unclear. Mass and angular momentum transfer in close binaries account for the rapid rotation of a major fraction of Be stars, supported by the previous detection of low-mass stripped companions to them. The stripped companions can be helium burning subdwarf OB-type stars (sdOBs), and white dwarfs (WDs). Aims. The main objective of this study is to characterise the identified Be stars in the y…

Perturbative QCD reveals the softening of matter in the cores of massive neutron stars
Oleg Komoltsev
https://arxiv.org/abs/2506.06465 https://

Perturbative QCD reveals the softening of matter in the cores of massive neutron stars
The cores of neutron stars (NSs) contain the densest matter in the universe. Rapid advancements in neutron-star observations allow unprecedented empirical access to cold, ultra-dense Quantum Chromodynamics (QCD) matter. The combination of these observations with theoretical calculations has revealed previously inaccessible features of the equation of state (EoS) and the QCD phase diagram. In this thesis, I demonstrate how perturbative-QCD calculations at asymptotically high baryon densities pro…

The DORCHA suite: nature, nurture, and the phase space distribution of the Milky Way's high redshift progenitors today
Sreedhar Balu, Chris Power, Kris Walker, J. Stuart B. Wyithe
https://arxiv.org/abs/2506.14016

The DORCHA suite: nature, nurture, and the phase space distribution of the Milky Way's high redshift progenitors today
Where in the present-day Milky Way should we search for the remnants of its earliest stars? We address this question using the DORCHA (Gaelic for Dark; DUR-uh-khuh) suite: a set of 25 high-resolution, dark-matter-only cosmological zoom-in simulations of Milky Way analogue (MWA) haloes evolved to $z=0$. Of these, 15 are isolated and the rest are in pairs, similar to the MW and M31. By identifying and tagging the most bound material in high-redshift ($z\geq5$) progenitor haloes -- those likely to…

Using the Coolest Ae Stars to Constrain Circumstellar Disk Viscosity
R. Anusha, T. A. A. Sigut
https://arxiv.org/abs/2506.04486 https://

Using the Coolest Ae Stars to Constrain Circumstellar Disk Viscosity
Classical Ae (CAe) stars are main sequence, A-type stars with Hα emission but no signature of dust. They are thought to be the cool extension of the classical Be stars to lower masses. Recent surveys based on Hα spectroscopy have significantly increased the number of known CAe stars, with the population extending to spectral types as cool as A4 (Teff approx. 8500 K). We compute the temperature structure of gaseous, circumstellar disks around A-type stars, including both radiative heating from…

Core-Corona Decomposition of Very Compact (Neutron) Stars: Accounting for Current Data of XTE J1814-338
Rico Z\"ollner, Burkhard K\"ampfer
https://arxiv.org/abs/2506.10032

Core-Corona Decomposition of Very Compact (Neutron) Stars: Accounting for Current Data of XTE J1814-338
A core-corona decomposition of compact (neutron) star models was compared with the current mass-radius data of the outlier XTE~J1814-338. The corona (which may also be dubbed the envelope, halo or outer crust) is assumed to be of Standard Model matter, with an equation of state that is supposed to be faithfully known and accommodates nearly all other neutron star data. The core, solely parameterized by its mass, radius and transition pressure, presents a challenge regarding its composition. We …

On the accretion luminosity of Class I protostars
L. Testi, A. Natta, S. Gozzi, C. F. Manara, J. P. Williams, R. Claes, U. Lebreuilly, P. Hennebelle, R. Klessen, S. Molinari
https://arxiv.org/abs/2506.14601

On the accretion luminosity of Class I protostars
The value of the accretion luminosity during the early phases of star formation is a crucial information which helps us understand how stars form, yet it is still very difficult to obtain. We develop a new methodology to measure accretion luminosity using mid-infrared hydrogen recombination lines, and apply it to a limited sample of Class~I protostars in the Taurus and Ophiuchus star forming regions. We adopt the commonly used assumption that the properties of disk-protostar accretion in Class …

Interstellar dust production, destruction and effects of dust depletion in galaxies
Francesco Calura
https://arxiv.org/abs/2506.13851 https://

Interstellar dust production, destruction and effects of dust depletion in galaxies
Despite its small mass fraction typically observed in the interstellar medium, dust plays a significant role as a key component of galaxies, affecting a wide range of properties. This review focuses specifically on how dust grains influence interstellar chemical abundances and on the processes that regulate the evolution of the galactic dust budget. I describe the main physical processes regulating dust evolution, including production by stars and other sources, destruction in supernova shocks …

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
Matching seismic masses for RR Lyrae-type and oscillating red horizontal-branch stars in M4

Stellar Ancestry Unlocked: Chemical and Orbital Clues Link Metal Poor Stars to Globular Clusters and the Galaxy's Thick Disk
Gizay Yolalan, Timur \c{S}ahin, Sel\c{c}uk Bilir, Olcay Plevne
https://arxiv.org/abs/2506.10400

Stellar Ancestry Unlocked: Chemical and Orbital Clues Link Metal Poor Stars to Globular Clusters and the Galaxy's Thick Disk
This study presents a detailed chemical, kinematic, and orbital dynamic analysis of five metal poor stars in the solar neighborhood: HD 2665, HD 5916, HD 122956, HD 189349, and HD 218857. Using high-resolution spectroscopic data from the ELODIE and ESPaDOnS instruments, we derived elemental abundances for 29 species (25 elements: C, O, Na, Mg, Al, Si, S, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd, and Sm) via LTE based analysis with ATLAS9 model atmospheres. Notably, we re…

ABYSS III: Observing accretion activity in young stars through empirical veiling measurements
Serat Saad, Marina Kounkel, Keivan G. Stassun, A. Roman-Lopes, Carlos G. Rom\'an-Z\'u\~niga, Jinyoung Serena Kim, Jonathan C. Tan, R. Lopez-Valdivia
https://arxiv.org/abs/2506.09826

ABYSS III: Observing accretion activity in young stars through empirical veiling measurements
Stellar accretion plays an important role in the early stages of stellar evolution, particularly in Classical T Tauri Stars (CTTSs). Accretion of a CTTS can be related to different physical parameters such as effective temperature (T$_{\text{eff}}$), age, abundance of hydrogen, etc. We can infer how accretion works by examining it across different wavelength regions. Accretion can be traced using veiling, a parameter that measures how excess emission from accretion affects the photospheric spec…

A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10
Xiangyu Li, Huiling Chen, Yang Huang, Huawei Zhang, Timothy C. Beers, Linxuan Zhu, Jifeng Liu
https://arxiv.org/abs/2506.09705

A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10
We present a catalog of 8,440 candidate very metal-poor (VMP; [Fe/H] < -2.0) main-sequence turn-off (MSTO) and red giant stars in the Milky Way, identified from low-resolution spectra in LAMOST DR10. More than 7,000 of these candidates are brighter than G ~ 16, making them excellent targets for high-resolution spectroscopic follow-up with 4-10 meter-class telescopes. Unlike most previous studies, we employed an empirical calibration to estimate metallicities from the equivalent widths (EWs) of …

The TESS Ten Thousand Catalog: 10,001 uniformly-vetted and -validated Eclipsing Binary Stars detected in Full-Frame Image data by machine learning and analyzed by citizen scientists
Veselin B. Kostov, Brian P. Powell, Aline U. Fornear, Marco Z. Di Fraia, Robert Gagliano, Thomas L. Jacobs, Julien S. de Lambilly, Hugo A. Durantini Luca, Steven R. Majewski, Mark Omohundro, Jerome Orosz, Saul A. Rappaport, Ryan Salik, Donald Short, William Welsh, Svetoslav Alexandrov, Cledison Marcos da Si…

The TESS Ten Thousand Catalog: 10,001 uniformly-vetted and -validated Eclipsing Binary Stars detected in Full-Frame Image data by machine learning and analyzed by citizen scientists
The Transiting Exoplanet Survey Satellite (TESS) has surveyed nearly the entire sky in Full-Frame Image mode with a time resolution of 200 seconds to 30 minutes and a temporal baseline of at least 27 days. In addition to the primary goal of discovering new exoplanets, TESS is exceptionally capable at detecting variable stars, and in particular short-period eclipsing binaries which are relatively common, making up a few percent of all stars, and represent powerful astrophysical laboratories for …

Chandra X-ray Measurement of Heavy Element Abundances of Wolf-Rayet Stars in the Galactic Center
Ziqian Hua, Zhiyuan Li
https://arxiv.org/abs/2506.08587 ht…

Chandra X-ray Measurement of Heavy Element Abundances of Wolf-Rayet Stars in the Galactic Center
Elemental abundances hold important information about the star formation history in the Galactic Center. The thermal X-ray spectra of certain stars can provide a robust probe of elemental abundances, mainly through the presence of K-shell emission lines. In this work, based on deep archival {\it Chandra} observations, we obtain X-ray measurements of five heavy elements (Si, S, Ar, Ca and Fe) for three sources in the Arches cluster, one source in the Quintuplet cluster, as well as a field source…

The Evolution Of Rotating Supermassive Pop III Stars On The Main Sequence
Devesh Nandal, Ga\"el Buldgen, Daniel J. Whalen, John Regan, Tyrone E. Woods, Jonathan C. Tan
https://arxiv.org/abs/2506.08268

The Evolution Of Rotating Supermassive Pop III Stars On The Main Sequence
The detection of billion-solar-mass supermassive black holes (SMBHs) within the first billion years of cosmic history challenges conventional theories of black hole formation and growth. Simultaneously, recent JWST observations revealing exceptionally high nitrogen-to-oxygen abundance ratios in galaxies at high redshifts raise critical questions about rapid chemical enrichment mechanisms operating in the early universe. Supermassive stars (SMSs) with masses of 1000 to 10000 M$_{\odot}$ are prom…

A New Determination of the Mass of NGC 3603-A1: the Most Massive Binary Known?
Philip Massey, Sarah Bodansky, Laura R. Penny, Kathryn F. Neugent
https://arxiv.org/abs/2506.13522

A New Determination of the Mass of NGC 3603-A1: the Most Massive Binary Known?
The star NGC 3603-A1 has long been known to be a very massive binary, consisting of a pair of O2-3If*/WN5-6 stars, which show Wolf-Rayet-like emission due to their luminosities being near the Eddington limit. The system has been poorly characterized until now, due to the difficulties of obtaining reliable radial velocities from broad, blended emission lines and the extreme crowding in the cluster. However, previously unpublished archival HST/STIS spectra revealed that some of the upper Balmer l…

Formation Channels of Gravitationally Resolvable Double White Dwarf Binaries Inside Globular Clusters
Lucas Hellstr\"om, Miros{\l}aw Giersz, Abbas Askar, Arkadiusz Hypki, Yuetong Zhao, Youjun Lu, Siqi Zhang, Ver\'onica V\'azquez-Aceves, Grzegorz Wiktorowicz
https://arxiv.org/abs/2506.13122

Formation Channels of Gravitationally Resolvable Double White Dwarf Binaries Inside Globular Clusters
Current gravitational wave detectors are sensitive to coalescing black holes and neutron stars. However, double white dwarfs (DWDs) have long been recognized as promising sources of gravitational waves, and upcoming detectors like LISA will be able to observe these systems in abundance. DWDs are expected to be the dominant gravitational wave (GW) sources in parts of the LISA frequency range, making it crucial to understand their formation for future detections. The Milky Way contains many white…

Vintage NPOI: New and Updated Angular Diameters for 145 Stars
Ellyn K. Baines, James H. Clark III, Bradley I. Kingsley, Henrique R. Schmitt, Jordan M. Stone
https://arxiv.org/abs/2506.02912

Vintage NPOI: New and Updated Angular Diameters for 145 Stars
We present new or updated angular diameters, physical radii, and effective temperatures for 145 stars from the Navy Precision Optical Interferometer data archive. We used data from 1996 to late-2021, and we describe the differences between early and late data, which hinge upon an update of the beam combiner in 2002. We came across several sub-categories of stars of interest: 13 of our stars are promising targets for the Habitable World Observatory and therefore require as much study as possible…

Precise Age For The Binary HD 21278 In The Young Alpha Persei Cluster
Christopher A. Danner, Eric L. Sandquist, Gail H. Schaefer, Luigi R. Bedin, Christopher D. Farrington, Cyprien Lanthermann, Stefan Kraus, Robert Klement, Narsireddy Anugu, John D. Monnier, Jerome A. Orosz, Isabelle Codron, Tyler Gardner, Mayra Gutierrez, Benjamin R. Setterholm, Jeremy Jones, Becky Flores
…

Precise Age For The Binary HD 21278 In The Young Alpha Persei Cluster
We present a study of the double-lined spectroscopic binary HD 21278 that contains one of the brightest main sequence stars in the young $α$ Persei open cluster. We analyzed new spectra and reanalyzed archived spectra to measure precise new radial velocity curves for the binary. We also obtained interferometric data using the CHARA Array at Mount Wilson to measure the sky positions of the two stars and the inclination of the $\sim$ 2 milliarcsecond orbit. We determine that the two stars have m…

Shaping core dynamos in A-type stars: The role of dipolar fossil fields
J. P. Hidalgo, P. J. K\"apyl\"a, D. R. G Schleicher, C. A. Ortiz-Rodr\'iguez, F. H. Navarrete
https://arxiv.org/abs/2506.01017

Shaping core dynamos in A-type stars: The role of dipolar fossil fields
Large-scale magnetic fields of Ap/Bp stars are stable over long timescales and have typically simple dipolar geometries, leading to the idea of a fossil origin. These stars are also expected to have convective cores that can host strong dynamo action. We aim to study the interaction between the magnetic fields generated by the convective core dynamo of the star, and a dipolar fossil field reminiscent of observed magnetic topologies of Ap/Bp stars. We use numerical 3D star-in-a-box simulations o…

K2 observations of five pulsating subdwarf B stars with white dwarf companions
M. D. Reed, A. S. Baran, J. H. Telting, R. H. Ostensen, C. S. Jeffery, Y. Gaibor
https://arxiv.org/abs/2506.05033

K2 observations of five pulsating subdwarf B stars with white dwarf companions
We report seismic analyses of five pulsating subdwarf B (sdBV) stars observed during Kepler's K2 mission, each with a white dwarf companion. We find three of the five to be g-mode-dominated hybrid pulsators. For the other two, we only detect g modes. We determine rotation periods from frequency multiplets for four stars and each rotates subsynchronously to its binary period, including PG 0101+039 and PG 0902+124 both with binary periods near 0.57 days and spin periods near 9 days. We detect fre…

Binarity at LOw Metallicity (BLOeM): Pipeline-Determined Physical Properties of OB Stars
J. M. Bestenlehner, Paul A. Crowther, V. A. Bronner, S. Simon-Diaz, D. J. Lennon, J. Bodensteiner, N. Langer, P. Marchant, H. Sana, F. R. N. Schneider, T. Shenar
https://arxiv.org/abs/2506.00117

Binarity at LOw Metallicity (BLOeM): Pipeline-Determined Physical Properties of OB Stars
We aim to determine the physical properties of OB stars from the multi-epoch VLT/FLAMES BLOeM spectroscopic survey of the Small Magellanic Cloud. We apply a pipeline designed to analyse large spectroscopic samples of OB stars to the co-added, initial 9 epochs of the BLOeM survey, utilising grids of synthetic model spectra computed with the stellar atmosphere code FASTWIND. 69 OB stars are excluded from the analysis owing to disk emission or significant contamination by secondaries in SB2 binari…

This https://arxiv.org/abs/2506.02763 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Homogeneous Stellar Atmospheric Parameters and 22 Elemental Abundances for FGK Stars Derived From LAMOST Low-resolution Spectra with DD-Payne
A deep understanding of our Galaxy desires detailed decomposition of its stellar populations via their chemical fingerprints. This requires precise stellar abundances of many elements for a large number of stars. Here we present an updated catalog of stellar labels derived from LAMOST low-resolution spectra in a physics-sensible and rigorous manner with DD-Payne, taking labels from high-resolution spectroscopy as training set. The catalog contains atmospheric parameters for 6.4 million stars re…

New Symbiotic Stars from LAMOST DR10 Spectra and Multi-band Photometry
Jing Chen, Liang Wang, Yin-Bi Li, Xiao-Xiao Ma, A-Li Luo, Zi-Chong Zhang, Ming-Yi Ding, Kai Zhang
https://arxiv.org/abs/2506.09352

New Symbiotic Stars from LAMOST DR10 Spectra and Multi-band Photometry
Symbiotic star (SySt) is long-period interacting binary system, typically consisting of a white dwarf and a red giant surrounded by a nebula. These systems are natural astrophysical laboratories for investigating binary star evolution. In this paper, we identified nine SySts from the LAMOST DR10 low-resolution spectra survey, seven of which were previously known, while two are newly identified. Initially, we selected LAMOST spectra exhibiting typical SySt emission lines (e.g., $\rm H_α, ~H_β,…

X-Shooting ULLYSES: Massive stars at low metallicity. XIII. Putting the bi-stability jump to the test in the LMC
T. Alkousa (Astrophysics Research Cluster, School of Mathematical and Physical Sciences, University of Sheffield), P. A. Crowther (Astrophysics Research Cluster, School of Mathematical and Physical Sciences, University of Sheffield), J. M. Bestenlehner (Astrophysics Research Cluster, School of Mathematical and Physical Sciences, University of Sheffield, School of Chemical, M…

X-Shooting ULLYSES: Massive stars at low metallicity. XIII. Putting the bi-stability jump to the test in the LMC
We aim to investigate the theoretical bi-stability jump, which predicts an increase in mass-loss rates below 21 kK. We further aim to constrain the photospheric and wind parameters of a sample of 16 LMC late-O and B supergiants. We utilise the 1D, non-LTE radiative transfer model CMFGEN in a grid-based approach and subsequent fine-tuned spectroscopic fitting procedure to determine the stellar and wind parameters of each star. We apply this method to ultra-violet data from the ULLYSES programme …