Lunar occultations of young stars in southern Taurus.
SIMON M., BECK T.L., GREENE T.P., HOWELL R.R., LUMSDEN S. and PRATO L.
Abstract (from CDS):
We have obtained lunar occultation observations of NTT 042916+1751, V826 Tau, L1551-55, HN Tau, DQ Tau, and DR Tau by high-speed single-channel photometry in the IR K band. We detect no companions in the angular separation range 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 ∼2 mag of the primary in the range ∼0".08-10" and no companion of HL Tau within 1.5 mag and ∼0".09-10". The binary fraction of the 56 systems in the Taurus star formation region that have been surveyed by lunar occultation and imaging is 61%. Of the 56 systems, 53 have been surveyed for companions in the angular separation range 0".020-10". Their binary frequency is at least 1.4±0.3 times that measured by Duquennoy & Mayor for the nearby F and G stars. These values for the binary frequency are lower bounds because they contain no corrections for incompleteness.