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

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

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003iaus..211..257s&link_type=abstract

Brown Dwarfs, Proceedings of IAU Symposium #211, held 20-24 May 2002 at University of Hawaii, Honolulu, Hawaii. Edited by Eduard

Physics

Optics

Scientific paper

We have used the adaptive optics system Hokupa`a at Gemini North to search for companions from a flux-limited (K_s> 12) survey of 30 nearby M6.0-M7.5 dwarfs. Our observations, which are sensitive to companions with separations >0.1 arcsec (˜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%).

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