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Radio Emission from Binary Stars in the AB Doradus Moving Group

Published online by Cambridge University Press:  27 January 2016

R. Azulay ,
J.C. Guirado ,
J.M. Marcaide ,
I. Martí-Vidal  and
E. Ros
R. Azulay
Affiliation:
Departament d'Astronomia i Astrofísica, Universitat de València, E-46100 Burjassot, València, Spain email: rebecca.azulay@uv.es
J.C. Guirado
Affiliation:
Departament d'Astronomia i Astrofísica, Universitat de València, E-46100 Burjassot, València, Spain email: rebecca.azulay@uv.es Observatori Astronòmic, Universitat de València, E-46980 Paterna, València, Spain
J.M. Marcaide
Affiliation:
Departament d'Astronomia i Astrofísica, Universitat de València, E-46100 Burjassot, València, Spain email: rebecca.azulay@uv.es
I. Martí-Vidal
Affiliation:
Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, Sweden
E. Ros
Affiliation:
Departament d'Astronomia i Astrofísica, Universitat de València, E-46100 Burjassot, València, Spain email: rebecca.azulay@uv.es Observatori Astronòmic, Universitat de València, E-46980 Paterna, València, Spain Max-Planck-Institut für Radioastronomie, D-53121 Bonn, Germany
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Abstract

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Precise determination of dynamical masses of pre-main-sequence stars is essential for calibrating stellar evolution models, that are widely used to derive theoretical masses of young low-mass objects. We have determined the individual masses of the pair AB Dor Ba/Bb using Australian Long Baseline Array observations and archive infrared data, as part of a larger program directed to monitor binary systems in the AB Doradus moving group. We have detected, for the first time, compact radio emission from both stars. This has allowed us to determine the orbital parameters of both the relative and absolute orbits and, consequently, their individual dynamical masses: 0.28±0.05 M⊙ and 0.25±0.05 M⊙. Comparisons of the dynamical masses with the prediction of pre-main-sequence (PMS) evolutionary models show that the models underpredict the dynamical masses of the binary components Ba and Bb by 10–30% and 10–40%, respectively.

Keywords

astrometrybinaries (including multiple): closestars: fundamental parametersstars: pre-main sequence
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S314: Young Stars & Planets Near the Sun , November 2015 , pp. 117 - 118
Copyright
Copyright © International Astronomical Union 2016 

References

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