Direct Detection of the Companion of Chi 1 Orionis
arXiv:astro-ph/0209404 · doi:10.1051/0004-6361:20021377
Abstract
We present an H-band image of the companion of Chi 1 Orionis taken with the Keck adaptive optic system and NIRC2 camera equipped with a 300mas-diameter coronographic mask. The direct detection of this companion star enables us to calculate dynamical masses using only Kepler's laws M_A = 1.01 +/- 0.13 M_Sun, M_B = 0.15 +/- 0.02 M_Sun, and to study stellar evolutionary models at a wide spread of masses. The application of Baraffe et al. (1998) pre-main-sequence models implies an age of 70-130 Myrs. This is in conflict to the age of the primary, a confirmed member of the Ursa Major Cluster with a canonical age of 300 Myrs. As a consequence, either the models at low masses underestimate the age or the Ursa Major Cluster is considerably younger than assumed.
4 pages, accepted by A & A Letters 2002 September 19
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