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The unique spectrum of the brown dwarf candidate GD 165B and comparison to the spectra of other low-luminosity objects
Kirkpatrick, J. D.; Henry, Todd J.; Liebert, James
AA(Steward Observatory, Tucson, AZ), AB(Steward Observatory, Tucson, AZ), AC(Steward Observatory, Tucson, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 2, p. 701-707. (ApJ Homepage)
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NASA/STI Keywords:
Brown Dwarf Stars, Faint Objects, Red Dwarf Stars, Stellar Luminosity, Stellar Spectra, Energy Distribution, H Alpha Line, Molecular Absorption, Stellar Magnitude, Stellar Temperature
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The paper compares the 6300-9000-A spectrum of GD 165 B to spectra of three of the lowest-luminosity red objects known: LHS 2924, LHS 2065, and PC 0025+0447. A temperature for this object is estimated using extrapolations to absolute magnitude vs temperature for low-mass stars. Two estimates are given for the location of GD 165 B on the H-R diagram. Neither data point yields an unambiguous classification as either star or brown dwarf for this object. It is concluded that GD 165 B has redder colors and fainter absolute magnitudes than any known main sequence star, with a spectrum unlike that of any known M dwarf.

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