Companions to white dwarfs - Very low-mass stars and the brown dwarf candidate GD 165B

Details Companions to white dwarfs - Very low-mass stars and the brown dwarf candidate GD 165B Companions to white dwarfs - Very low-mass stars and the brown dwarf candidate GD 165B

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386..260z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 10, 1992, p. 260-264.

Astronomy and Astrophysics

Astrophysics

92

Binary Stars, Brown Dwarf Stars, Companion Stars, Stellar Mass, White Dwarf Stars, Cool Stars, Star Formation, Stellar Luminosity

Scientific paper

The initial mass function (IMF) for star formation at the bottom of the main sequence is estimated by measuring the number of low-luminosity companions to white dwarfs. A histogram of the number of companions versus luminosity indicates that the IMF is flat or increasing with decreasing stellar mass down to, at least, 0.1 solar mass. It is shown that GD 165B has the same proper motion as the white dwarf GD 165A. Thus, the former is the coolest and lowest luminosity dwarf star ever imaged and may be a brown dwarf, although most recent theoretical models would position it as a transition object at the very bottom of the main sequence (M = 0.075 solar mass.

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