2003A&A...408..681K


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.18CET04:57:50

2003A&A...408..681K - Astronomy and Astrophysics, volume 408, 681-688 (2003/9-3)

The interferometric diameter and internal structure of Sirius A.

KERVELLA P., THEVENIN F., MOREL P., BORDE P. and DI FOLCO E.

Abstract (from CDS):

The interferometric observations of dwarf stars in the solar neighbourhood, combined with Hipparcos parallaxes provide very precise values of their linear diameters. In this paper, we report the direct measurement of the angular diameter of the bright star Sirius A with the VINCI/VLTI instrument. We obtain a uniform disk angular diameter of θUD=5.936±0.016mas in the K band and a limb darkened value of θLD=6.039±0.019mas. In combination with the Hipparcos parallax of 379.22±1.58mas, this translates into a linear diameter of 1.711±0.013D. Using the VINCI/VLTI interferometric diameter and the published properties of Sirius A, we derive internal structure models corresponding to ages between 200 and 250±12Myr. This range is defined mainly by the hypothesis on the mass of the star, the overshoot and the metallicity.

Abstract Copyright:

Journal keyword(s): stars: individual: Sirius - stars: fundamental parameters - stars: evolution - techniques: interferometric

Simbad objects: 9

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Number of rows : 9

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 * 31 Ori V* 05 29 43.9814689897 -01 05 32.058230061   6.28 4.71     K4III 85 0
2 * del Lep PM* 05 51 19.2961264 -20 52 44.723152 5.54 4.83 3.85 2.99 2.43 K0IIIbFe-1.5CH0.5 198 0
3 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A1V+DA 1383 0
4 * alf CMa B WD* 06 45 09.3021501316 -16 43 00.716804119   8.41 8.44     DA1.9 491 1
5 * q Car LP* 10 17 04.9753050 -61 19 56.288301   4.899 3.350     K2.5II 123 0
6 * alf Crt PM* 10 59 46.4648602 -18 17 55.617244 6.14 5.16 4.07 3.27 2.72 K0IIIb 197 0
7 * tet Cen PM* 14 06 40.94752 -36 22 11.8371 3.94 3.04 2.05 1.29 0.76 K0-IIIb 236 0
8 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 877 1
9 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1121 0

    Equat.    Gal    SGal    Ecl

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2020.02.18-04:57:50

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