L and T brown dwarfs in the Ursa Major moving group

Details L and T brown dwarfs in the Ursa Major moving group L and T brown dwarfs in the Ursa Major moving group

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005an....326.1020b&link_type=abstract

Astronomische Nachrichten, Vol.326, Issue 10, p.1020-1021

Astronomy and Astrophysics

Astronomy

2

Stars: Kinematics, Galaxies: Star Clusters, Open Clusters And Associations: Individual (Ursa Major)

Scientific paper

We have applied the ``moving cluster'' method to an archive of L and T brown dwarf stars to identify those stars which are members of the Ursa Major moving group. We show that five stars have proper motion directions which agree with the direction of motion expected for a cluster member, and which have proper motion distances in agreement with distances determined by trigonometrical parallax observations. We then use 2MASS data to produce an M_K versus J-K_S colour magnitude diagram. The group members define an empirical 400 Myr isochrone, which is compared to theoretical models. This is the first cluster/group to have a known T dwarf member.

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