Astron. Astrophys. Suppl. Ser.
Volume 120, Number 1, November II 1996
|Page(s)||57 - 61|
|Published online||15 November 1996|
Grids of pre-main sequence stellar models. The accretion scenario at Z=0.001 and Z=0.020
Observatoire de Genève, CH-1290 Sauverny, Switzerland e-mail: email@example.com
Accepted: 5 April 1996
I present and briefly discuss a new set of pre-main sequence (MS) evolutionary tracks computed in the framework of the accretion paradigm for star formation at metallicities Z=0.001 and Z=0.020. Improved birthlines are obtained from a time-dependent prescription for the accretion rate. These evolutionary sequences are better suited than the canonical approach which starts arbitrarily high on a luminous Hayashi adiabat, to interpret color-magnitude diagrams and ages of young stellar associations. They also constitute a (both physical and numerical) self-consistent extension to the post-MS stellar models previously published by the Geneva group (Schaller et al. 1992).
Key words: stars: evolution / stars: pre-main sequence / Hertzsprung-Russel (HR) diagram
© European Southern Observatory (ESO), 1996