Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 384, Issue 1, Pages 150-160Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2007.12675.x
Keywords
instrumentation : high angular resolution; methods : observational; techniques : high angular resolution; binaries : close; stars : low-mass, brown dwarfs
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Funding
- Science and Technology Facilities Council [ST/F001967/1, PP/C002229/1] Funding Source: researchfish
- STFC [ST/F001967/1, PP/C002229/1] Funding Source: UKRI
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We present results from a high angular resolution survey of 77 very low mass (VLM) binary systems with 6.0 <= V - K colour <= 7.5 and proper motion >= 0.15 arcsec yr(-1). 21 VLM binaries were detected, 13 of them new discoveries. The new binary systems range in separation between 0.18 and 1.3 arcsec. The distance-corrected binary fraction is 13.6(-4)(+6.5) per cent, in agreement with previous results. Nine of the new binary systems have projected separations > 10 au, including a new wide VLM binary with 27 au projected orbital separation. One of the new systems forms two components of a 2300 au separation triple system. We find that the projected separation distribution of the binaries with V - K < 6.5 in this survey appears to be different from that of redder (lower mass) objects, suggesting a possible rapid change in the orbital radius distribution at around the M5 spectral type. The target sample was also selected to investigate X-ray activity among VLM binaries. There is no detectable correlation between excess X-ray emission and the frequency and binary properties of the VLM systems.
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