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Discovery of Three Very Low Mass Binary Systems: An Adaptive Optics Survey of M6.0–M7.5 Stars

Published online by Cambridge University Press:  26 May 2016

Nick Siegler
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ, USA 85721 nsiegler@as.arizona.edu
Laird M. Close
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ, USA 85721 nsiegler@as.arizona.edu
Eric E. Mamajek
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ, USA 85721 nsiegler@as.arizona.edu
Melanie Freed
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ, USA 85721 nsiegler@as.arizona.edu
Corresponding
E-mail address:

Abstract

We have used the adaptive optics system Hōkūpa'a at Gemini North to search for companions from a flux-limited (Ks > 12) survey of 30 nearby M6.0–M7.5 dwarfs. Our observations, which are sensitive to companions with separations > 0.1″ (~ 2.8 AU), detect 3 new binary systems. This implies an overall binary fraction of 9±4% for M6.0–M7.5 binaries. This binary frequency is somewhat less than the 19±7% measured for late M stars and ~ 20% for L stars, but is still statistically consistent. However, the result is significantly lower than the binary fractions observed amongst solar mass main sequence stars (~60%) and early M stars (~35%).

Type
Part 6. Searches for Substellar Companions
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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Freed, M., Close, L. M., & Siegler, N. 2002, ApJ submitted Google Scholar
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Siegler, N., Close, L. M., Mamajek, E. E., & Freed, M. 2002, in preparation Google Scholar
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