Abstract
A survey of 30 nearby M6.0–M7.5 dwarfs with Ks 12 and 0>29 (3–10 AU) with similar mass ratios (q > 0:8, DKs 20 AU), very low mass (Mtot 3 AU. This binary frequency is less than the � 32% measured among early M dwarfs over the same separation range. Two of the low-mass binaries are probable Hyades open cluster members based on proper motions, cluster membership probabilities, radial velocities, and near-IR photometry. LP 415-20 has the distinction of being the tightest (3.6 AU) multiple system ever spatially resolved in the cluster, and the companions of LP 415-20 and LP 475-855 are among the least massive objects ever resolved in the Hyades, with estimated masses of 0:081 þ0:009 � 0:010 and 0:082 þ0:009 � 0:009 M� . Subject headings: binaries: general — instrumentation: adaptive optics — open clusters and associations: individual (Hyades) — stars: individual (LP 415-20, LP 475-855, 2MASSW J1750129+442404) — stars: low-mass, brown dwarfs
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