Binary stars in the AB doradus moving group
Paper in proceedings, 2016

We present a study of the radio emission and kinematics of a sample of stars belonging to the AB Doradus moving group through VLBI observations. The main aim of our study is to obtain precise estimates of the dynamical mass of young, low-mass stars, which in combination with photometric measurements provide precise benchmarks for calibrating pre-main-sequence (PMS) stellar evolutionary models. Previous studies show that model predictions are in disagreement with experimental results for masses below 1.2 M. Among the stars included in our study, we emphasize the results obtained in two of them: AB Dor B and HD 160934, 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 M). Comparisons of the dynamical masses with the prediction of PMS evolutionary models show that the models underpredict the dynamical masses of the binary components by 10-40%.

Stellar Activity

Kepler

Starspots

Giant stars

Author

R. Azulay

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, Onsala Space Observatory, Observation Support

Eduardo Ros

Max Planck Society

Proceedings of the 12th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics IX, SEA 2016

12th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics IX, SEA 2016
Bilbao, Spain,

Subject Categories

Meteorology and Atmospheric Sciences

Astronomy, Astrophysics and Cosmology

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