Lithium detection in a field brown dwarf candidate

Details Lithium detection in a field brown dwarf candidate Lithium detection in a field brown dwarf candidate

Publishing date

Jan 1997

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.284..507t&link_type=abstract

Journals

Monthly Notices of the Royal Astronomical Society, Volume 284, Issue 2, pp. 507-512.

Science

Astronomy and Astrophysics

Field

Astronomy

Additional info 2

16

Additional info 3

Stars: Low-Mass, Brown Dwarfs.

Type

Scientific paper

Abstract

We report the first detection of the lithium resonance line (6708 A) in a field brown dwarf candidate. Brown dwarfs, by definition, do not achieve the core temperatures necessary for stable hydrogen burning. Lithium has a lower fusion temperature than hydrogen and has been proposed as an age indicator for young low-mass stars. The new brown dwarf candidate was discovered from a survey using photographic plates with selection solely based on red colour, which avoids kinematic and hence age bias. Interpreted within the best available models, the presence of lithium and its inferred temperature (2800+/-200 K) rule out the possibility that it is a younger, pre-main-sequence star and indicate a mass of 0.065+/-0.025 Msolar. Its brightness (I=14.6) will allow high-resolution spectroscopy of lithium and other light elements enabling calibration of the atmospheric and evolutionary models for very low-mass objects.

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