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Brown and Black Dwarfs: their Structure, Evolution and Contribution to the Missing Mass

Published online by Cambridge University Press:  25 April 2016

D. J. Stevenson
D. J. Stevenson*
Affiliation:
Research School of Earth Sciences, Australian National University
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Extract

According to Oort (1965), the mass density in the solar neighbourhood (inferred from the gravity component normal to the galactic plane) is between 50% and 150% greater than the mass density inferred from non-dwarf stars. One possible explanation for the “missing mass” is an overabundance of faint M-dwarfs (Weistrop 1972), but present indications are that this overabundance is either small (Weistrop 1976; Sanduleak 1976) or non-existent (Faber et al. 1976; Eggen 1976). Nevertheless, Salpeter’s initial mass function (Salpeter 1955) suggests that the total mass may be dominated by low mass stars, including masses M≤0.08M⊙ which never undergo significant hydrogen burning.

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Contributions
Information
Publications of the Astronomical Society of Australia , Volume 3 , Issue 3 , 1978 , pp. 227 - 229
Copyright
Copyright © Astronomical Society of Australia 1978

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