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Astron. Astrophys. 358, 593-599 (2000)
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]](img1.gif)
. 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
This article contains no SIMBAD objects.
Contents
- 1. Introduction
- 2. The stellar evolution code
- 2.1. Opacity tables
- 2.2. Treatment of the atmosphere
- 2.3. Equation of state
- 2.3.1. A new variable
- 2.3.2. Physical ingredients of the EOS
- 3. Pre-Main sequence computations
- 3.1. Initial models
- 3.2. The grids
- 3.3. Our fitted solar model
- 4. Comparison with other studies
- 5. Internet interface to stellar model requests
- 6. Conclusion
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: June 8, 2000
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