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 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 } = 4 850 \pm 500 Myr , an initial helium mass fraction Y _ { i } = 0.300 \pm 0.008 , and an initial metallicity ( Z / X ) _ { i } = 0.0459 \pm 0.0019 , with M _ { A } = 1.100 \pm 0.006 M _ { \odot } and M _ { B } = 0.907 \pm 0.006 M _ { \odot } for \alpha Cen A & B .