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| Query : 2003A&A...408..681K |
2003A&A...408..681K - Astronomy and Astrophysics, volume 408681-688 (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
| 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 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | * 31 Ori | V* | 05 29 43.9820095248 | -01 05 32.058334392 | 6.28 | 4.71 | K4III | 99 | 0 | |||
| 2 | * del Lep | PM* | 05 51 19.2960278488 | -20 52 44.730655825 | 5.54 | 4.83 | 3.85 | 2.99 | 2.43 | K0IIIbFe-1.5CH0.5 | 222 | 0 |
| 3 | * alf CMa | SB* | 06 45 08.91728 | -16 42 58.0171 | -1.51 | -1.46 | -1.46 | -1.46 | -1.43 | A0mA1Va | 1610 | 0 |
| 4 | * alf CMa B | WD* | 06 45 09.3041925037 | -16 43 00.724740067 | 8.41 | 8.44 | DA1.9 | 563 | 1 | |||
| 5 | * q Car | LP* | 10 17 04.9755364660 | -61 19 56.296709026 | 4.899 | 3.350 | K2.5II | 147 | 0 | |||
| 6 | * alf Crt | PM* | 10 59 46.4651557828 | -18 17 55.630394216 | 6.14 | 5.16 | 4.07 | 3.27 | 2.72 | K0IIIb | 224 | 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 | 262 | 1 |
| 8 | * alf Cen B | PM* | 14 39 35.06311 | -60 50 15.0992 | 2.89 | 2.21 | 1.33 | K1V | 1092 | 2 | ||
| 9 | * alf Cen A | SB* | 14 39 36.49400 | -60 50 02.3737 | 0.96 | 0.72 | 0.01 | G2V | 1352 | 1 |
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