EROS 2 proper motion survey:
a field brown dwarf, and an L dwarf companion to LHS 102

B.Goldman, X.Delfosse, Th.Forveille, C.Afonso et al.
(the EROS collaboration)

Abstract:

We report the discovery of two L dwarfs (the new spectral class defined for dwarfs cooler than the M type) in a two-epoch CCD proper motion survey of 413 square degrees, complemented by infrared photometry from DENIS. One of them has a strong lithium line, which for very cool dwarfs is a proof of brown dwarf status. The other is a common proper motion companion to the mid-M dwarf LHS 102 (GJ 1001), which has a well determined trigonometric parallax. LHS 102B is thus one of the coolest L dwarfs of known distance and luminosity.

Keywords:

Galaxy: halo - Galaxy: kinematics and dynamics - dark matter - stars: low-mass, brown dwarfs

Comments:

5 pages, 5 postscript figures

Status:

Published by A&A Letters, 351 L5-9 (1999)

 

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