Volume 449, Number 1, April I 2006
|Page(s)||327 - 334|
|Section||Stellar structure and evolution|
|Published online||16 March 2006|
AO Velorum: a young quadruple system with a ZAMS eclipsing BpSi primary
Complejo Astronómico El Leoncito, Casilla 467, 5400 San Juan, Argentina
2 European Southern Observatory, Casilla 19001, Santiago 19, Chile
3 Department of Astronomy, University of Vienna, Tuerkenschanzstrasse 17, 1180 Vienna, Austria
4 Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire d'Astrophysique, Observatoire, 1290 Sauverny, Switzerland
Accepted: 11 November 2005
Using recent spectroscopic observations, we show that the triple system AO Vel with an eclipsing BpSi primary is in fact a remarkable quadruple system formed by two double-lined spectroscopic binaries with components close to the ZAMS. All available data have been reanalyzed to derive proper orbital parameters for both binary systems and to calculate absolute parameters of the eclipsing system. For the first time, direct determination of the radius and the mass have been obtained for a BpSi star. The study of the physical parameters of this unique system is especially important since it can be used as a test of evolutionary models for very young stars of intermediate mass.
Key words: stars: binaries: spectroscopic / stars: chemically peculiar / stars: fundamental parameters / stars: magnetic fields
© ESO, 2006
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