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L and T brown dwarfs in the Ursa Major moving group
Author(s) -
Bannister N. P.,
Jameson R. F.
Publication year - 2005
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200510431
Subject(s) - physics , proper motion , parallax , stars , astrophysics , pleiades , group (periodic table) , brown dwarf , cluster (spacecraft) , diagram , open cluster , astronomy , mathematics , statistics , quantum mechanics , computer science , programming language
Abstract 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. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)