Results 91 to 100 of about 726,750 (238)
Explaining the Praesepe blue straggler HD 73666 [PDF]
, 2009 The blue straggler phenomenon is not yet well explained by current theory; however, evolutionary models of star clusters call for a good knowledge of it.
Adams +59 more
core +2 more sources
Ultra-metal-poor Stars: Spectroscopic Determination of Stellar Atmospheric Parameters Using Iron Non-LTE Line Abundances [PDF]
, 2016 We present new ultra-metal-poor stars parameters with [Fe/H] < −4.0 based on line-by-line non-local thermodynamic equilibrium (NLTE) abundances using an up-to-date iron model atom with a new recipe for non-elastic hydrogen collision rates.
R. Ezzeddine, A. Frebel, B. Plez
semanticscholar +1 more source
NLTE Analysis of Copper Lines in Different Stellar Populations [PDF]
Astrophysical Journal, 2018 The copper abundances of 29 metal-poor stars are determined based on the high-resolution, high-signal-to-noise ratio spectra from the UVES spectrograph at the ESO VLT telescope. Our sample consists of the stars of the Galactic halo, thick- and thin-disk,
J. R. Shi +3 more
semanticscholar +1 more source
Stellar Collisions and Blue Straggler Formation
, 2001 We review recent 3D hydrodynamic calculations of stellar collisions using the Smoothed Particle Hydrodynamics (SPH) method, and we discuss the implications of the results for the formation and evolution of blue stragglers in globular clusters. We also discuss the construction of simple analytic models for merger remnants, approximating the mass loss ...
Lombardi, James C., Rasio, Frederic A.
openaire +2 more sources
Effects of stellar collisions on star cluster evolution and core collapse
, 2007 We systematically study the effects of collisions on the overall dynamical evolution of dense star clusters using Monte Carlo simulations over many relaxation times.
Frederic A. Rasio +3 more
core +1 more source
Light clusters in warm stellar matter: explicit mass shifts and universal cluster-meson couplings [PDF]
, 2018 In-medium modifications of light cluster properties in warm stellar matter are studied within the relativistic mean-field approximation. In-medium effects are included by introducing an explicit binding energy shift analytically calculated in the Thomas ...
H. Pais +3 more
semanticscholar +1 more source
Evidence for a Catastrophically Disrupted Open Cluster
The Astrophysical JournalOf the many discoveries uncovered by the Gaia astrometric mission, some of the most exciting are related to nearby dispersed stellar structures. We analyze one such structure in the Milky Way disk, OCSN-49, a coeval stellar stream with 257 identified ...
Alexis N. Miller +7 more
doaj +1 more source
Mg line formation in late-type stellar atmospheres - I. The model atom [PDF]
, 2015 Context. Magnesium is an element of significant astrophysical importance, often traced in late-type stars using lines of neutral magnesium, which is expected to be subject to departures from local thermodynamic equilibrium (LTE).
Y. Osorio +8 more
semanticscholar +1 more source
Coupled Disk-star Evolution in Galactic Nuclei and the Lifetimes of QPE Sources
The Astrophysical JournalA modest fraction of the stars in galactic nuclei fed toward the central supermassive black hole (SMBH) approach on low-eccentricity orbits driven by gravitational-wave radiation (extreme mass ratio inspiral (EMRI)).
Itai Linial, Brian D. Metzger
doaj +1 more source
Radio emission models of Colliding-Wind Binary Systems
, 2003 We present calculations of the spatial and spectral distribution of the radio emission from a wide WR+OB colliding-wind binary system based on high-resolution hydrodynamical simulations and solutions to the radiative transfer equation.
Benaglia +53 more
core +1 more source