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Issue A&A
Volume 473, Number 1, October I 2007
Page(s) 181 - 184
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20077332



A&A 473, 181-184 (2007)
DOI: 10.1051/0004-6361:20077332

Impact of the new solar abundances on the calibration of the PMS binary system RS Chamaeleontis

E. Alecian1, Y. Lebreton2, M.-J. Goupil1, M.-A. Dupret1, and C. Catala1

1  Observatoire de Paris, LESIA, 5 place Jules Janssen, 92195 Meudon Principal Cedex, France
    e-mail: evelyne.alecian@obspm.fr
2  Observatoire de Paris, GEPI, UMR 8111, 5 place Jules Janssen, 92195 Meudon Principal Cedex, France

(Received 19 February 2007 / Accepted 28 May 2007)

Abstract
Context.In a recent work, we tried to obtain a calibration of the two components of the pre-main sequence binary system RS Cha by means of theoretical stellar models. We found that the only way to reproduce the observational parameters of RS Cha with standard stellar models is to decrease the initial abundances of carbon and nitrogen derived from the GN93 solar mixture of heavy elements by a few tenths of dex.
Aims.In this work, we aim to reproduce the observational properties of the RS Cha stars with stellar evolution models based on the new AGS05 solar mixture recently derived from a three-dimensional solar model atmosphere. The AGS05 mixture is depleted in carbon, nitrogen and oxygen with respect to the GN93 mixture.
Methods.We calculated new stellar models of the RS Cha components using the AGS05 mixture and appropriate opacity tables. We sought models that simultaneously satisfy the observations of the two components (masses, radii, luminosities, effective temperatures and metallicity).
Results.We find that it is possible to reproduce the observational data of the RS Cha stars with AGS05 models based on standard input physics. From these models, the initial helium content of the system is $Y\sim0.255$ and its age is $\sim $ $9.13 \pm 0.12$ Myr.


Key words: stars: pre-main-sequence -- stars: abundances -- stars: evolution -- stars: interiors -- stars: binaries: eclipsing -- stars: binaries: spectroscopic



© ESO 2007


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