Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-03-31
Astron.Astrophys.358:593-599,2000
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures, accepted for publication in A&A Main Journal
Scientific paper
We present new grids of pre-main sequence (PMS) tracks for stars in the mass range 0.1 to 7.0 Msun. The computations were performed for four different metallicities (Z=0.01, 0.02, 0.03 and 0.04). A fifth table has been computed for the solar composition (Z=0.02), including a moderate overshooting. We describe the update in the physics of the Grenoble stellar evolution code which concerns mostly changes in the equation of state (EOS) adopting the formalism proposed by Pols et al. (1995) and in the treatment of the boundary condition. Comparisons of our models with other grids demonstrate the validity of this EOS in the domain of very low-mass stars. Finally, we present a new server dedicated to PMS stellar evolution which allows the determination of stellar parameters from observational data, the calculation of isochrones, the retrieval of evolutionary files and the possibility to generate graphic outputs. WWW site : http://www-laog.obs.ujf-grenoble.fr/activites/starevol/evol.html
Dufour Emmanuelle
Forestini Manuel
Siess Lionel
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