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Astron. Astrophys. Suppl. Ser.
Volume 120, Number 1, November_II 1996
Page(s) 57 - 61
Grids of pre-main sequence stellar models. The accretion scenario at Z=0.001 and Z=0.020 DOI: 10.1051/aas:1996274

Astronomy and Astrophysics Supplement Series, Vol. 120, November II 1996, 57-61

Grids of pre-main sequence stellar models. The accretion scenario at Z=0.001 and Z=0.020

P.A. Bernasconi

Observatoire de Genève, CH-1290 Sauverny, Switzerland

Received February 12; accepted April 5, 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

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