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We report adaptive optics (AO) observations of the young and nearbyassociation MBM 12 obtained with the Canada-France-Hawaii Telescope. Our mainobservational result is the discovery of six new binary systems, LkHa 264, E0255+2018, RX J0255.4+2005, S18, MBM 12-10, RX J0255.3+1915, and theconfirmation of HD 17332, already known as a binary. We also detected apossible quadruple system. It is composed of the close binary LkHa 263 AB(separation of 0.41 ''), of LkH\alpha 262 located 15.25 '' from LkHa 263 A, andof LkHa 263 C, located 4.1 '' from LkH\alpha 263 A. A preliminary study of thebinary fraction suggests a binary excess in the MBM 12 association as comparedto the field and IC 348. Because of the high binarity rate, previousestimations of spectral types and measurements of IR excesses for severalcandidate members of MBM 12 have to be revised. LkH\alpha 263 C is a nebulousobject that we interpret as a disk oriented almost perfectly edge-on and seenin scattered light. This object has already been reported by Jayawardhana etal. (2002). Scattered light models allow us to estimate some of the structuralparameters (i.e. inclination, diameter and to a lesser extent dust mass) of thecircumstellar disk. We find an inclination of 89^o and a outer radius for thedisk, 165 AU if the distance to MBM 12 is 275 pc. With the present data set, wedo not attempt to re-assess the distance to MBM 12. We estimate however thatthe distance to the candidate member RX J0255.3+1915 is d > 175 pc.Comment: 9 pages, 1 figure postscript, 6 figures .gi

Adaptive optics imaging of the MBM 12 association