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Astron. Astrophys. 358, 593-599 (2000)

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An internet server for pre-main sequence tracks of low- and intermediate-mass stars

L. Siess, E. Dufour and M. Forestini

Observatoire de Grenoble, Laboratoire d'Astrophysique, Université Joseph Fourier, B.P. 53, 38041 Grenoble Cedex 9, France

Received 8 December 1999 / Accepted 31 March 2000

Abstract

We present new grids of pre-main sequence (PMS) tracks for stars in the mass range 0.1 to 7.0[FORMULA]. 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.

Key words: equation of state – stars: evolution – stars: Hertzsprung – Russel (HR) and C-M diagrams – stars: pre-main sequence – astronomical data bases: miscellaneous

Send offprint requests to: Lionel Siess

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© European Southern Observatory (ESO) 2000

Online publication: June 8, 2000
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