EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 392/1 Article
Free access article

Issue A&A
Volume 392, Number 1, September II 2002
Page(s) L9 - L12
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20021074



A&A 392, L9-L12 (2002)
DOI: 10.1051/0004-6361:20021074

Letter

Asteroseismology and calibration of $\alpha$ Cen binary system

F. Thévenin1, J. Provost1, P. Morel1, G. Berthomieu1, F. Bouchy2 and F. Carrier2

1  Département Cassini, UMR CNRS 6529, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France
2  Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland

(Received 24 May (2002) / Accepted 22 July (2002) )

Abstract
Using the oscillation frequencies of $\alpha$ Cen A recently discovered by Bouchy & Carrier (2001, (2002)), the available astrometric, photometric and spectroscopic data, we tried to improve the calibration of the visual binary system $\alpha$ Cen. With the revisited masses of Pourbaix et al. 2002 we did not succeed in obtaining a solution satisfying all the seismic observational constraints. Relaxing the constraints on the masses, we have found an age $t_{\rm\alpha\,Cen}=4850\pm500$ Myr, an initial helium mass fraction $Y_{\rm i} = 0.300\pm0.008$, and an initial metallicity $(Z/X)_{\rm i}=0.0459\pm0.0019$, with $M_{\rm A}=1.100\pm0.006\,M_\odot$ and $M_{\rm B}=0.907\pm0.006\,M_\odot$ for $\alpha$ Cen A & B.


Key words: stars: binaries: visual -- stars: evolution -- stars: oscillation -- stars: fundamental parameters -- stars: individual: $\alpha$ Cen

Offprint request: F. Thévenin, Frederic.Thevenin@obs-nice.fr

SIMBAD Objects



© ESO 2002


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.