2003/06/28 by P. Kervella, F. Thévenin, F. Thevenin +4 · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20030994
published as Astron.Astrophys.408:681-688,2003 · 9 pages, 4 figures, accepted for publication by A&A
arxiv created 2003/06/28 · openalex publication_date 2003/08/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
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 mas in the K band and a limb darkened value of mas. In combination with the Hipparcos parallax of mas, this translates into a linear diameter of . Using the VINCI/VLTI interferometric diameter and the published properties of Sirius A, we derive internal structure models corresponding to ages between 200 and Myr. This range is defined mainly by the hypothesis on the mass of the star, the overshoot and the metallicity.