We have carried out near-infrared spectroscopic observations of 23 very
low-luminosity young stellar object (YSO) candidates and 5 their companions in
Heiles Cloud 2, one of the densest parts of the Taurus molecular cloud. Twelve
objects were confirmed as YSOs by Br gamma feature. The effective temperatures
of the YSOs and of the companions are estimated from the 2.26 micron feature,
the 2.21 micron feature, and the H2O band strengths. Detailed comparisons of
our photometric and spectroscopic observations with evolutionary tracks on the
HR diagram suggest some objects to be very low-mass YSOs.Comment: 15 pages, 19 figures. PASJ accepte
