Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-06
Astron.Astrophys.400:297-302,2003
Astronomy and Astrophysics
Astrophysics
6 pages, 2 figures, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20030006
A reliable age estimation for the field brown dwarf LP 944-20 is accomplished through the analysis of its kinematic properties. The space velocities of this star strongly suggest its membership in the so-called Castor moving group. LP 944-20 can be sensibly assumed to have the group's age, which is estimated to be ~320 Myr, and metal content, which is found to be roughly solar. With these new constrains and the available photometry and lithium abundance, current brown dwarf models are put to a test. Using the IR magnitudes and the lithium diagnostics, the models are able to provide a reasonable description of the brown dwarf's properties (to within a few sigma) but yield an age which is roughly 50% larger than our estimate. Possible reasons for this discrepancy are discussed.
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