Asteroseismology and calibration of alpha Cen binary system

Details Asteroseismology and calibration of alpha Cen binary system Asteroseismology and calibration of alpha Cen binary system

2002-06-17

arxiv.org/abs/astro-ph/0206283v1

Astronomy and Astrophysics

Astrophysics

accepted for publication as a letter in A&A

Scientific paper

10.1051/0004-6361:20021074

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 t_alpha Cen=4850+-500 Myr, an initial helium mass fraction Y_i = 0.300+-0.008, and an initial metallicity (Z/X)_i=0.0459+-0.0019, with M_A=1.100+-0.006M_o and M_B=0.907+-0.006M_o for alpha Cen A&B.

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