Asteroseismology and calibration of alpha Cen binary system
F. Thevenin, J. Provost, P. Morel, G. Berthomieu, F. Bouchy, F. Carrier
Abstract
Using the oscillation frequencies of alpha Cen A recently discovered by Bouchy & Carrier, 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 do not succeed to obtain a solution satisfying all the seismic observational constraints. Relaxing the constraints on the masses, we have found an age talpha Cen=4850+-500 Myr, an initial helium mass fraction Yi = 0.300+-0.008, and an initial metallicity (Z/X)i=0.0459+-0.0019, with MA=1.100+-0.006Mo and MB=0.907+-0.006Mo for alpha Cen A&B.
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