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An expanded set of brown dwarf and very low mass star models
Burrows, A.; Hubbard, W. B.; Saumon, D.; Lunine, J. I.
AA(Arizona Univ., Tucson, AZ), AB(Arizona Univ., Tucson, AZ), AC(Arizona Univ., Tucson, AZ), AD(Arizona Univ., Tucson, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 158-171. (ApJ Homepage)
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NASA/STI Keywords:
Brown Dwarf Stars, Early Stars, Stellar Luminosity, Stellar Mass, Stellar Models, Deuterium, Helium, Metallicity
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We present in this paper updated and improved theoretical models of brown dwarfs and late M dwarfs. The evolution and characteristics of objects between 0.01 and 0.2 solar mass are exhaustively investigated and special emphasis is placed on their properties at early ages. The dependence on the helium fraction, deuterium fraction, and metallicity of the masses, effective temperature and luminosities at the edge of the hydrogen main sequence are calculated. We derive luminosity functions for representative mass functions and compare our predictions to recent cluster data. We show that there are distinctive features in the theoretical luminosity functions that can serve as diagnostics of brown dwarf physics. A zero-metallicity model is presented as a bound to or approximation of a putative extreme halo population.

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arXiv e-prints