Binary stars in loose associations: AB Dor B and HD 160934
Paper in proceeding, 2014
Precise determination of dynamical masses of pre-main- sequence (PMS) stars is necessary to calibrate PMS stellar evolutionary models, whose predictions are in disagreement with measurements for masses below 1.2 Msun. Binary stars in young, nearby loose associations are particularly good candidates, since all members share a common age. We present phase-reference VLBI observations of two binary systems that belong to the AB Doradus moving, HD 160934 A/c and AB Dor Ba/Bb, from which we have measured both the relative and absolute orbital motion. Accordingly, we obtained precise estimates of the mass of the components of these binaries (ranging from 0.25 to 0.7 Msun). We will show how these measurements provide precise calibration points for testing PMS models of low-mass stars.
Author
R. Azulay
Max-Planck Institute for Radio Astronomy
Universitat de Valencia
J. C. Guirado
Universitat de Valencia
J. M. Marcaide
Universitat de Valencia
Ivan Marti-Vidal
Chalmers, Earth and Space Sciences, Onsala Space Observatory
Eduardo Ros
Universitat de Valencia
Max-Planck Institute for Radio Astronomy
Proceedings of the 11th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics VIII, SEA 2014
447-452
11th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics VIII, SEA
Teruel, Spain,
Teruel, Spain,
Subject Categories
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
Infrastructure
Onsala Space Observatory