Lunar occultations of young stars in southern taurus

We have obtained lunar occultation observations of NTT 042916+1751, V826 Ta u, L1551-55, HN Tau, DQ Tau, and DR Tau by high-speed single-channel photom etry in the IR K band. We detect no companions in the angular separation ra nge 0."020-10" to a magnitude limit typically 2 mag fainter than the target . Additional occultation observations of GG Tau and HL Tau using IR cameras at K reveal no new stars in the GG Tau A binary within similar to 2 mag of the primary in the range similar to 0."08-10" and no companion of HL Tau w ithin 1.5 mag and similar to 0."09-10". The binary fraction of the 56 syste ms in the Taurus star formation region that have been surveyed by lunar occ ultation and imaging is 61%. Of the 56 systems, 53 have been surveyed for c ompanions in the angular separation range 0."020-10". Their binary frequenc y is at least 1.4+/-0.3 times that measured by Duquennoy & Mayor for the ne arby F and G stars. These values for the binary frequency are lower bounds because they contain no corrections for incompleteness.