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| Query : 2003A&A...404.1087K |
2003A&A...404.1087K - Astronomy and Astrophysics, volume 4041087-1097 (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 θUD[A]=8.314±0.016mas and θUD[B]=5.856±0.027mas, and limb darkened angular diameters of θLD[A]=8.511±0.020mas and θLD[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.
Abstract Copyright: ∼
Journal keyword(s): techniques: interferometric - stars: binaries: visual - stars: evolution - stars: oscillations - stars: fundamental parameters - stars: individual: α Cen
Simbad objects: 10
| 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 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | * eps Eri | BY* | 03 32 55.8444911587 | -09 27 29.739493865 | 5.19 | 4.61 | 3.73 | 3.00 | 2.54 | K2V | 2073 | 1 |
| 2 | * 39 Eri | PM* | 04 14 23.6878980552 | -10 15 22.620462156 | 7.18 | 6.07 | 4.90 | 4.01 | 3.44 | K2III | 121 | 0 |
| 3 | * gam02 Vol | PM* | 07 08 44.8656955896 | -70 29 56.149447560 | 4.774 | 3.746 | K0III | 80 | 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 | 262 | 1 |
| 5 | * alf Cen B | PM* | 14 39 35.06311 | -60 50 15.0992 | 2.89 | 2.21 | 1.33 | K1V | 1092 | 2 | ||
| 6 | * alf Cen A | SB* | 14 39 36.49400 | -60 50 02.3737 | 0.96 | 0.72 | 0.01 | G2V | 1352 | 1 | ||
| 7 | * alf Cen | ** | 14 39 36.50 | -60 50 02.3 | 0.4 | -0.1 | G2V+K1V | 1031 | 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: | 93 | 0 |
| 9 | HD 216149 | * | 22 51 02.1589579824 | -39 09 24.608634876 | 6.851 | 5.400 | K3III | 59 | 0 | |||
| 10 | * alf PsA | PM* | 22 57 39.04625 | -29 37 20.0533 | 1.31 | 1.25 | 1.16 | 1.11 | 1.09 | A4V | 1303 | 3 |
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