2003A&A...404.1087K

Query : 2003A&A...404.1087K

2003A&A...404.1087K - Astronomy and Astrophysics, volume 404, 1087-1097 (2003/6-4)

The diameters of α Centauri A and B. A comparison of the asteroseismic and VINCI/VLTI views.

KERVELLA P., THEVENIN F., SEGRANSAN D., BERTHOMIEU G., LOPEZ B., MOREL P. and PROVOST J.

Abstract (from CDS):

We compare the first direct angular diameter measurements obtained on our closest stellar neighbour, αCentauri, to recent model diameters constrained by asteroseismic observations. Using the VINCI instrument installed at ESO's VLT Interferometer (VLTI), the angular diameters of the two main components of the system, αCenA and B, were measured with a relative precision of 0.2% and 0.6% respectively. Particular care has been taken in the calibration of these measurements, considering that VINCI is estimating the fringe visibility using a broadband K filter. We obtain uniform disk angular diameters for αCenA and B of θ_UD[A]=8.314±0.016mas and θ_UD[B]=5.856±0.027mas, and limb darkened angular diameters of θ_LD[A]=8.511±0.020mas and θ_LD[B]=6.001±0.034mas. Combining these values with the parallax from Soederhjelm (1999A&A...341..121S), we derive linear diameters of D[A]=1.224±0.003D_☉ and D[B]=0.863±0.005D_☉. These values are compatible with the masses published by Thevenin et al. (2002A&A...392L...9T) for both stars.

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

Simbad objects: 10

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Number of rows : 10

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	* eps Eri	BY*	03 32 55.8444911587	-09 27 29.739493865	5.19	4.61	3.73	3.00	2.54	K2V	1885	1
2	* 39 Eri	PM*	04 14 23.6878980552	-10 15 22.620462156	7.18	6.07	4.90	4.01	3.44	K2III	111	0
3	* gam02 Vol	PM*	07 08 44.8656955896	-70 29 56.149447560		4.774	3.746			K0III	74	0
4	* tet Cen	PM*	14 06 40.94752	-36 22 11.8371	3.94	3.04	2.05	1.29	0.76	K0-IIIb	252	1
5	* alf Cen B	PM*	14 39 35.06311	-60 50 15.0992	2.89	2.21	1.33			K1V	1005	2
6	* alf Cen A	SB*	14 39 36.49400	-60 50 02.3737	0.96	0.72	0.01			G2V	1258	1
7	* alf Cen	**	14 39 40.4	-60 50 20		0.4	-0.1			G2V+K1V	935	0
8	* E Hya	PM*	14 50 17.3082918816	-27 57 37.300431780	7.28	5.81	4.41	3.33	2.57	K2.5IIIbFe-1:	84	0
9	HD 216149	*	22 51 02.1589579824	-39 09 24.608634876		6.851	5.400			K3III	56	0
10	* alf PsA	PM*	22 57 39.04625	-29 37 20.0533	1.31	1.25	1.16	1.11	1.09	A4V	1216	3

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