Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-20
Astronomy and Astrophysics
Astrophysics
7 pages, 6 figures, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20066208
We present resolved NACO photometry of the close binary AB Dor B in H- and Ks-band. AB Dor B is itself known to be a wide binary companion to AB Dor A, which in turn has a very low-mass close companion named AB Dor C. These four known components make up the young and dynamically interesting system AB Dor, which will likely become a benchmark system for calibrating theoretical pre-main sequence evolutionary mass tracks for low-mass stars. However, for this purpose the actual age has to be known, and this subject has been a matter of discussion in the recent scientific literature. We compare our resolved photometry of AB Dor Ba and Bb with theoretical and empirical isochrones in order to constrain the age of the system. This leads to an age estimate of about 50 to 100 Myr. We discuss the implications of such an age range for the case of AB Dor C, and compare with other results in the literature.
Bouy Herve
Brandner Wolfgang
Close Laird
Hartung Markus
Henning Thomas
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