Results 21 to 30 of about 1,638 (254)

PRE-MAIN SEQUENCE EVOLUTIONS OF SOLAR ABUNDANCE LOW MASS STARS [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2007
We present the Pre-Main Sequence (PMS) evolutionary tracks of stars with 0.065~5.0M_⨀. The models were evolved from the PMS stellar birthline to the onset of hydrogen burning in the core.
Youn Kil Jung, Y. -C. Kim
doaj   +1 more source

Stellar Evolutionary Models: challenges from observations of stellar systems [PDF]

open access: yesProceedings of the International Astronomical Union, 2006
Abstract We briefly review some constraints for stellar models in various mass regimes and evolutionary stages as provided by observational data from spectroscopy to multi-wavelenghts photometry. The accuracy of present generation of stellar models can be significantly improved only through an extensive comparison between theory and observations.
openaire   +2 more sources

Evolutionary sequences of stellar models with new radiative opacities. VI. $Z=0.0001$ [PDF]

open access: yesAstronomy and Astrophysics Supplement Series, 1996
We present a large grid of stellar evolutionary models with the initial chemical composition (Z = 0:0001;Y =0 :23). These tracks are conceived to extend the grid of stellar models described in the previous papers of this series, and are computed with the new radiative opacities by Iglesias et al. (1992) and convective overshoot.
Girardi, L.   +4 more
openaire   +1 more source

Influence of the initial orbital period and accretion efficiency on the low-mass binary evolution [PDF]

open access: yesSerbian Astronomical Journal, 2021
This paper presents detailed evolutionary models of low-mass binary systems (1.25 + 1 M⊙) with initial orbital periods of 10, 50 and 100 days and accretion efficiency of 10%, 20%, 50%, and a conservative assumption.
Petrović J.
doaj   +1 more source

Young Populous Clusters in the Magellanic Clouds – Implications for Stellar Evolutionary Models [PDF]

open access: yesSymposium - International Astronomical Union, 1999
We present new UV, visual and Hα photometry obtained with the WFPC2 of NGC 330, NGC 1818, NGC 2004 and NGC 2100, four young populous clusters in the MCs. We present observational evidence for a degree of convective core overshoot in excess of that currently applied in standard models.
Stefan C. Keller   +2 more
openaire   +1 more source

Chemical element transport in stellar evolution models [PDF]

open access: yesRoyal Society Open Science, 2017
Stellar evolution computations provide the foundation of several methods applied to study the evolutionary properties of stars and stellar populations, both Galactic and extragalactic.
Maurizio Salaris, Santi Cassisi
doaj   +1 more source

Probing high-mass stellar evolutionary models with binary stars [PDF]

open access: yesProceedings of the International Astronomical Union, 2014
AbstractMass discrepancy is one of the problems that is pending a solution in (massive) binary star research field. The problem is often solved by introducing an additional near core mixing into evolutionary models, which brings theoretical masses of individual stellar components into an agreement with the dynamical ones.
openaire   +3 more sources

Linking Circumstellar Disk Lifetimes to the Rotational Evolution of Low-mass Stars

open access: yesThe Astrophysical Journal, 2023
The high-energy radiation emitted by young stars can have a strong influence on their rotational evolution at later stages. This is because internal photoevaporation is one of the major drivers of the dispersal of circumstellar disks, which surround all ...
K. Monsch   +4 more
doaj   +1 more source

Non-gray rotating stellar models and the evolutionary history of the Orion Nebular Cluster [PDF]

open access: yesAstronomy & Astrophysics, 2006
17 pages, 11 ...
Landin, Natália R.   +4 more
openaire   +2 more sources

Benchmarking pre-main sequence stellar evolutionary tracks using disk-based dynamical stellar masses

open access: yesAstronomy & Astrophysics
Stellar masses are a fundamental property to understand models of pre-main sequence evolution, but their values derived from Hertzsprung–Russell (HR) diagrams are strongly model dependent.
Zallio Luigi   +16 more
doaj   +1 more source

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