Journal Article

Proper motions of field L and T dwarfs – II

S. L. Casewell, R. F. Jameson and M. R. Burleigh

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 390, issue 4, pages 1517-1526
Published in print November 2008 | ISSN: 0035-8711
Published online October 2008 | e-ISSN: 1365-2966 | DOI:
Proper motions of field L and T dwarfs – II

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By using images taken with Wide Field Camera (WFCAM) on United Kingdom Infrared Telescope (UKIRT) and Son of ISAAC (SofI) on the New Technology Telescope (NTT) and combining them with Two Micron All Sky Survey (2MASS) we have measured proper motions for 126 L and T dwarfs in the dwarf archive. Two of these L dwarfs appear to have M dwarf common proper motion companions, and two also appear to be high-velocity dwarfs, indicating possible membership of the thick disc. We have also compared the motion of these 126 objects to that of numerous moving groups, and have identified new members of the Hyades, Ursa Major and Pleiades moving groups. These new objects, as well as those identified in Jameson et al. have allowed us to refine the L dwarf sequence for Ursa Major that was defined by Jameson et al.

Keywords: stars: kinematics; stars: low-mass, brown dwarfs; open clusters and associations: individual: Ursa Major; open clusters and associations: individual: Hyades; open clusters and associations: individual: Pleiades

Journal Article.  7520 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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