CLUMPY ULTRACOMPACT H-II REGIONS .1. FULLY SUPERSONIC WIND-BLOWN MODELS

We propose that a significant fraction of the ultracompact H II region s found in massive star-forming clouds are the result of the interacti on of the wind and ionizing radiation from a young massive star with t he clumpy molecular cloud gas in its neighbourhood. Distributed mass l oading in the flow allows the compact nebulae to be long-lived. In thi s paper, we discuss a particularly simple case, in which the flow in t he H II region is everywhere supersonic. The line profiles predicted f or this model are highly characteristic, for the case of uniform mass loading. We discuss briefly other observational diagnostics of these m odels.