Status Report

The field brown dwarf LP 944-20 and the Castor moving group

By SpaceRef Editor
January 7, 2003
Filed under , ,

Astrophysics, abstract
astro-ph/0301063


From: Ignasi Ribas <[email protected]>
Date: Mon, 6 Jan 2003 08:55:51 GMT (24kb)

The field brown dwarf LP 944-20 and the Castor moving group


Authors:
I. Ribas (Univ. Barcelona)

Comments: 6 pages, 2 figures, accepted for publication in A&A


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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