Journal Article

A new population of brown dwarfs

M. R. S. Hawkins, C. Ducourant, H. R. A. Jones and M. Rapaport

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 294, issue 3, pages 505-512
Published in print March 1998 | ISSN: 0035-8711
Published online March 1998 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-8711.1998.01294.x
A new population of brown dwarfs

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Abstract

In this paper we report the first results from a survey for low-mass stars and brown dwarfs, based on a photographic stack of around 100 Schmidt plates. This survey extends photographic searches by about 2 mag, and covers an area of 25 deg2. Some 30 faint objects with large R-I colours were selected for further study, and were found to have very strong molecular absorption in their spectra, but only moderately red infrared colours. Five of these stars were selected for a parallax programme; three of these were found to be at a distance of around 45 pc, implying a very low luminosity. On the basis of their luminosity alone it is clear that these stars are field brown dwarfs, and we discuss their likely evolutionary status in the context of current models of low-mass stellar evolution.

Keywords: surveys; stars: evolution; stars: low-mass, brown dwarfs

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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