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Calibration of the Pre-Main Sequence Binary System RS Cha: Impact of the Initial Chemical Mixture

Published online by Cambridge University Press:  09 August 2007

E. Alecian ,
Y. Lebreton ,
M.-J. Goupil ,
M.-A. Dupret  and
C. Catala
E. Alecian
Affiliation:
Observatoire de Paris, LESIA, CNRS UMR 8109 5 place Janssen, 92195 Meudon, France, email: evelyne.alecian@obspm.fr
Y. Lebreton
Affiliation:
Observatoire de Paris, GEPI, CNRS UMR 8111, 5 place Janssen, 92195 Meudon, France
M.-J. Goupil
Affiliation:
Observatoire de Paris, LESIA, CNRS UMR 8109 5 place Janssen, 92195 Meudon, France, email: evelyne.alecian@obspm.fr
M.-A. Dupret
Affiliation:
Observatoire de Paris, LESIA, CNRS UMR 8109 5 place Janssen, 92195 Meudon, France, email: evelyne.alecian@obspm.fr
C. Catala
Affiliation:
Observatoire de Paris, LESIA, CNRS UMR 8109 5 place Janssen, 92195 Meudon, France, email: evelyne.alecian@obspm.fr
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Abstract

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Accurate observational data are available for the eclipsing double-lined spectroscopic binary system RS Cha, composed of two stars in the pre-main sequence stage of evolution: masses, radii, luminosities and effective temperatures of each component and metallicity of the system. This allows to build pre-main sequence stellar models representing the components of RS Cha and to constrain them in terms of physical ingredients, initial chemical composition and age.

We present stellar models we have calculated using the CESAM stellar evolution code for different sets of physical inputs (opacities, nuclear reaction rates, etc.) and different initial parameters (global metallicity, helium abundance, individual abundances of heavy elements). We discuss their ability to reproduce the observational constraints simultaneously for the two components. We focus on the impact on the models of the chemical mixture adopted and we propose a calibration for the RS Cha system providing an estimate of its age and initial helium abundance.

Keywords

stars: pre–main-sequencestars: interiorsbinaries: generalSun: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 652 - 657
Copyright
Copyright © International Astronomical Union 2007

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