TY - JOUR
T1 - Improved age constraints for the AB Doradus quadruple system* (Research Note) the binary nature of AB Doradus B
AU - Janson, M.
AU - Brandner, W.
AU - Lenzen, R.
AU - Close, L.
AU - Nielsen, E.
AU - Hartung, M.
AU - Henning, T.
AU - Bouy, H.
PY - 2007/2
Y1 - 2007/2
N2 - 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.
AB - 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.
KW - Astrometry
KW - Binaries: visual
KW - Stars: fundamental parameters
KW - Stars: individual: AB doradus
KW - Stars: low-mass, brown dwarfs
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U2 - 10.1051/0004-6361:20066208
DO - 10.1051/0004-6361:20066208
M3 - Article
AN - SCOPUS:33846807788
SN - 0004-6361
VL - 462
SP - 615
EP - 620
JO - Astronomy and astrophysics
JF - Astronomy and astrophysics
IS - 2
ER -