LHS 2924 - A uniquely cool low-luminosity star with a peculiar energy distribution

Details LHS 2924 - A uniquely cool low-luminosity star with a peculiar energy distribution LHS 2924 - A uniquely cool low-luminosity star with a peculiar energy distribution

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..245p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. 245-251.

Astronomy and Astrophysics

Astrophysics

61

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

Scientific paper

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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