CLUMPY ULTRACOMPACT H-II REGIONS .3. COMETARY MORPHOLOGIES AROUND STATIONARY STARS

Cometary ultracompact H II regions have been modelled as the interacti on of the hypersonic wind from a moving star with the molecular cloud which surrounds the star. We here show that a similar morphology can e nsue even if the star is stationary with respect to the cloud material . We assume that the H II region is within a stellar wind bubble which is strongly mass loaded: the cometary shape results from a gradient i n the distribution of mass loading sources. This model circumvents pro blems associated with the necessarily high spatial velocities of stars in the moving star models.