2002A&A...392L...9T

Query : 2002A&A...392L...9T

2002A&A...392L...9T - Astronomy and Astrophysics, volume 392, L9-12 (2002/9-2)

Asteroseismology and calibration of α Cen binary system.

THEVENIN F., PROVOST J., MOREL P., BERTHOMIEU G., BOUCHY F. and CARRIER F.

Abstract (from CDS):

Using the oscillation frequencies of α CenA recently discovered by Bouchy & Carrier (2001A&A...374L...5B, 2002A&A...390..205B), the available astrometric, photometric and spectroscopic data, we tried to improve the calibration of the visual binary system αCen. With the revisited masses of Pourbaix et al. (2002A&A...386..280P) 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_αCen=4850±500Myr, 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_☉ and M_B=0.907±0.006M_☉ for α Cen A & B.

Abstract Copyright: ∼

Journal keyword(s): stars: binaries: visual - stars: evolution - stars: oscillation - stars: fundamental parameters - stars: individual: α Cen

Simbad objects: 3

Full paper

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Number of rows : 3

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Sp type	#ref 1850 - 2023	#notes
1	* alf Cen B	PM*	14 39 35.06311	-60 50 15.0992	2.89	2.21	1.33	K1V	1006	2
2	* alf Cen A	SB*	14 39 36.49400	-60 50 02.3737	0.96	0.72	0.01	G2V	1259	1
3	* alf Cen	**	14 39 40.4	-60 50 20		0.4	-0.1	G2V+K1V	936	0

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