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This paper discusses star formation in the 40 C18O molecular cloud cores in Taurus by studying relations between the cores and young stellar objects (YSOs). These C18O cores constitute a complete sample of dense gas in Taurus as described in detail by Onishi and coworkers. The YSOs treated in the present work fall into the following four categories : (1) starless H13CO`compact cores, (2) cold IRAS sources, (3) warm IRAS sources, and (4) T Tauri stars without far-infrared emission. Starless H13COc ompact cores are assumed to be protostellar condensations that are in a phase just prior to star formation, although they are not yet considered to be YSOs in the usual sense. In the present study, we shall call the objects 1 and 2 cold objects and objects 3 and 4 warm objects. They constitute the most complete sample of YSOs, including compact dense molecular condensations, at present.
Onishi et al. (Mon,) studied this question.