Binary stars in loose associations: AB Dor B and HD 160934
Paper i 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.

Författare

R. Azulay

Max-Planck Institut für Radioastronomie

Universitat de Valencia

J. C. Guirado

Universitat de Valencia

J. M. Marcaide

Universitat de Valencia

Ivan Marti-Vidal

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

Eduardo Ros

Universitat de Valencia

Max-Planck Institut für Radioastronomie

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,

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

Infrastruktur

Onsala rymdobservatorium

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2021-03-12