EROS 2 proper motion survey: a field brown dwarf, and an L dwarf companion to LHS 102
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. Based on observations made at the European Southern Observatory, La Silla, Chile.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1999
- DOI:
- 10.48550/arXiv.astro-ph/9905162
- arXiv:
- arXiv:astro-ph/9905162
- Bibcode:
- 1999A&A...351L...5E
- Keywords:
-
- GALAXY: KINEMATICS AND DYNAMICS;
- COSMOLOGY: DARK MATTER;
- STARS: LOW-MASS;
- BROWN DWARFS;
- Astrophysics
- E-Print:
- 5 pages, LaTeX, 6 postscript figures, style correction, two spectra of the discovered objects added, coordinates of the LHS102 pair corrected