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Ultra-Cool Very Low-Mass Binaries

Published online by Cambridge University Press:  13 May 2016

Eduardo L. Martín  and
Gibor Basri
Eduardo L. Martín
Affiliation:
Division of Geology and Planetary Sciences, Caltech, MC 150–21, Pasadena, CA 91125
Gibor Basri
Affiliation:
Astronomy Department, MC 3411, Univ. of California, Berkeley, CA 94720

Abstract

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Observations of ultra-cool (spectral type later than M6) binaries are summarized. Only a few systems are known, and all have been discovered in the past few years. We describe each of these discoveries. Despite their small numbers, some interesting trends among the binaries may be emerging. Ultra-cool binaries have a frequency similar to but perhaps a little less than stars (binary fraction ∼20%) and have mass ratios closer to unity, with respect to solar-type stars. Neither of these results can be considered firm, as there are far too few systems known, and observational biases would tend to move trends in these directions. There also seems to be a trend towards smaller separations in lower mass systems, which is less subject to observational biases. We discuss how these results fit into current ideas about binary formation, and favor a fragmentation scenario.

Type
III. Main Sequence Binary Statistics
Information
Symposium - International Astronomical Union , Volume 200: The Formation of Binary Stars , 2001 , pp. 55 - 63
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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