Results 71 to 80 of about 197,808 (272)
The Simultaneous Formation of Massive Stars and Stellar Clusters [PDF]
, 2009 We show that massive stars and stellar clusters are formed simultaneously, the global evolution of the forming cluster is what allows the central stars to become massive. We predict that massive star forming clumps, such as those observed in Motte et al. 2007, contract and grow in mass leading to the formation of massive stars.
arxiv +1 more source
FEBS Open Bio, EarlyView.Cerebral organoids were employed as a novel model to explore the neurotoxicity of soman. Soman inhibited acetylcholinesterase activity, increased cell apoptosis and upregulated endoplasmic reticulum (ER) stress markers glucose‐regulated protein 78 (GRP78), activating transcription factor 6 (ATF6) and C/EBP homologous protein (CHOP).
Yue Wei +7 more
wiley +1 more source
Inferring the velocity of early massive stars from the abundances of extremely metal-poor stars [PDF]
A&A 632, A62 (2019), 2019 The nature of the first massive stars may be inferred by investigating the origin of the extremely metal-poor (EMP) stars, likely formed from the ejecta of one or a few previous massive stars. We investigate the rotational properties of early massive stars by comparing the abundance patterns of EMP stars with rotating massive stellar models.
arxiv +1 more source
Massive Star Asteroseismology in Action [PDF]
Proceedings of the International Astronomical Union, 2014 AbstractAfter highlighting the principle and power of asteroseismology for stellar physics, we briefly emphasize some recent progress in this research for various types of stars. We give an overview of high-precision high duty-cycle space photometry of OB-type stars.
openaire +6 more sources
Neutron stars and massive quark matter [PDF]
Progress in Particle and Nuclear Physics, 1996 Using the Color-Dielectric model to describe quark confinement, including strange quarks and accounting for beta--equilibrium, we get masses for a static neutron star in the range $1.3\leq M/M_{\odot}\leq 1.54 $ for a radius $R\approx 9$ km. Rapid cooling through the direct URCA mechanism is obtained.
DRAGO, Alessandro +2 more
openaire +5 more sources
Rise of the First Super-Massive Stars [PDF]
, 2018 We use high resolution adaptive mesh refinement simulations to model the formation of massive metal-free stars in the early Universe. By applying Lyman-Werner (LW) backgrounds of 100 J$_{21}$ and 1000 J$_{21}$ respectively we construct environments conducive to the formation of massive stars.
arxiv +1 more source
The Influence of Disk Composition on the Evolution of Stars in the Disks of Active Galactic Nuclei
The Astrophysical Journal, 2023 Disks of gas accreting onto supermassive black holes, powering active galactic nuclei (AGN), can capture stars from nuclear star clusters or form stars in situ via gravitational instability. The density and thermal conditions of these disks can result in
Alexander J. Dittmann +2 more
doaj +1 more source
No preferential spatial distribution for massive stars expected from their formation [PDF]
, 2017 We analyse N-body and Smoothed Particle Hydrodynamic (SPH) simulations of young star-forming regions to search for differences in the spatial distributions of massive stars compared to lower-mass stars. The competitive accretion theory of massive star formation posits that the most massive stars should sit in deeper potential wells than lower-mass ...
arxiv +1 more source
Massive star clusters in galaxies [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2010 The ensemble of all star clusters in a galaxy constitutes its star cluster system . In this review, the focus of the discussion is on the ability of star clusters, particularly the systems of old massive globular clusters (GCs), to mark the early evolutionary history of galaxies.
openaire +5 more sources