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Radio Emission from Binary Stars in the AB Doradus Moving Group

R. Azulay ; J. C. Guirado ; J. M. Marcaide ; Ivan Marti-Vidal (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; E. Ros
Proceedings of the International Astronomical Union (1743-9213). Vol. 10 (2015), p. 117-118.
[Konferensbidrag, refereegranskat]

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.

Nyckelord: astrometry, binaries (including multiple): close, stars: fundamental parameters, stars: pre-main sequence



Denna post skapades 2016-06-10.
CPL Pubid: 237556

 

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