Paper:	Searching for Massive Protostars: a BIMA Survey of High-Mass Precursors
Volume:	267, Hot Star Workshop III: the Earliest Stages of Massive Star Birth
Page:	371
Authors:	Gibb, A. G.; Wyrowski, F.; Mundy, L. G.; Thompson, M. A.
Abstract:	We have observed a sample of 9 ultracompact HII regions which show extended submillimetre dust emission in the 3-mm lines of N2H+, CH3OH, C34S, CH3CN, C18O and 3-mm continuum. We detected 50 massive cores, most previously unknown and most with no embedded infrared or radio sources. Of those mapped in both N2H+ and C18O, 21% have weak or no C18O emission. These cores show evidence for CO depletion, and may therefore be undergoing collapse.

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