A C¹⁸O Survey of Dense Cloud Cores in Taurus: Star Formation

Abstract

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.