We have been conducting extensive surveys of low-luminosity young stellar sources (YSOs) in the Taurus molecular cloud and several other nearby clouds. The surveys consist of (1) a large area near-infrared (JHK) survey of the Taurus cloud with a relatively limited sensitivity (up to J = 15.2 mag) and (2) more sensitive near-infrared (JHK) surveys of limited regions of the Taurus and other clouds. Detailed analysis of the former survey has shown that there are a number of very low-luminosity YSOs in the Taurus molecular cloud and its luminosity function does not appear to have any cutoff. Some of them are likely to be very low-mass YSOs with less than 0.1 M_odot. Follow-up observations of deep near-infrared (ZJHK) imaging and near-infrared spectroscopy of the low-luminosity YSOs detected in the survey have also been carried out and their preliminary results will be also described in the paper.
IAU Joint Discussion
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