2003A&A...404.1087K


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.29CEST02:26:28

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 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

Status at CDS:  

Simbad objects: 10

goto Full paper

goto View the reference in ADS

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 - 2020
#notes
1 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1684 1
2 * 39 Eri ** 04 14 23.68902 -10 15 22.6083 7.18 6.04 4.86 4.01 3.44 K2III 100 0
3 * gam02 Vol PM* 07 08 44.8636348625 -70 29 56.123442258   4.774 3.746     K0III 63 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 237 0
5 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 811 0
6 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 891 1
7 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1134 0
8 * E Hya PM* 14 50 17.3014618197 -27 57 37.338519560 7.28 5.81 4.41 3.33 2.57 K2.5IIIbFe-1: 73 0
9 HD 216149 * 22 51 02.1592317599 -39 09 24.607417936   6.851 5.400     K3III 50 0
10 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1112 3

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2003A&A...404.1087K and select 'bookmark this link' or equivalent in the popup menu


2020.05.29-02:26:28

© Université de Strasbourg/CNRS

    • Contact