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Title:
LHS 2924 - A uniquely cool low-luminosity star with a peculiar energy distribution
Authors:
Probst, R. G.; Liebert, J.
Affiliation:
AA(Steward Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. 245-251. (ApJ Homepage)
Publication Date:
11/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
LATE STARS, M STARS, PECULIAR STARS, RED DWARF STARS, SPECTRAL ENERGY DISTRIBUTION, STELLAR LUMINOSITY, BROWN DWARF STARS, STELLAR COLOR, STELLAR MODELS, STELLAR SPECTROPHOTOMETRY, STELLAR TEMPERATURE
DOI:
10.1086/161442
Bibliographic Code:
1983ApJ...274..245P

Abstract

Spectroscopic and photometric surveys of the faint red stars in the LHS Catalogue show LP 271-25 = LHS 2924 to be a uniquely cool proper motion star with a peculiar spectrum and energy distribution. The best fit blackbody gives Te = 1950 + or - 150 K, but with stronger V flux and much weaker TiO and CaOH bands than are seen in known very late M dwarfs. Several alternative explanations for these properties are considered. The possibilities of a very cool white dwarf, late M subdwarf, or dusty M dwarf are eliminated. A super-metal-rich late M dwarf seems very unlikely. A white dwarf-red dwarf composite can satisfy photometric and spectroscopic requirements but requires the combination of two kinds of rare objects, each uniquely cool, and with an implied conflict in their ages. A single very late M dwarf or substellar-mass brown dwarf is favored, despite difficulties in explaining the spectrum and colors.

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