Volume 394, Number 3, November II 2002
|Page(s)||L43 - L46|
|Published online||21 October 2002|
Letter to the Editor
Direct detection of the companion of Orionis
Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, Germany
2 California Institute of Technology, 105-24 (Astronomy) 1200 E. California Blvd., Pasadena, CA 91125, USA
3 Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA
Corresponding author: B. König, firstname.lastname@example.org
Accepted: 18 September 2002
We present an H-band image of the companion of Orionis taken with the Keck adaptive optic system and NIRC 2 camera equipped with a 300 mas-diameter coronographic mask. The direct detection of this companion star enables us to calculate dynamical masses using only Kepler's laws (, ), and to study stellar evolutionary models at a wide spread of masses. The application of Baraffe et al. ([CITE]) 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.
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.