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Redman, M. P.,Williams, R. J. R.,Dyson, J. E.
1998
Unknown
Monthly Notices Of The Royal Astronomical Society
Cometary and bipolar ultracompact HII regions
Published
()
Optional Fields
298
33
41
Mass-loaded models can explain how a cometary morphology, ultracompact HII region can arise around a stationary star. The star is located in a density gradient in the mass-loading sources. Continuous mass-loss from the clumps embedded in the ionized gas allows the region to remain compact. The wind and radiation field from the central star set up a fully supersonic flow that is bounded by a recombination front. We develop the models further by calculating the velocity and density structure in detail for a variety of viewing angles, mass-loading laws and density scaleheights. The results are compared with observational work, and the agreements and differences are highlighted. We extend this model to show how a massive star located in a dense molecular ridge can give rise to a bipolar or ring morphology, depending on the viewing angle.Mass-loaded models can explain how a cometary morphology, ultracompact HII region can arise around a stationary star. The star is located in a density gradient in the mass-loading sources. Continuous mass-loss from the clumps embedded in the ionized gas allows the region to remain compact. The wind and radiation field from the central star set up a fully supersonic flow that is bounded by a recombination front. We develop the models further by calculating the velocity and density structure in detail for a variety of viewing angles, mass-loading laws and density scaleheights. The results are compared with observational work, and the agreements and differences are highlighted. We extend this model to show how a massive star located in a dense molecular ridge can give rise to a bipolar or ring morphology, depending on the viewing angle.
0035-87110035-8711
http://adsabs.harvard.edu/abs/1998MNRAS.298...33Rhttp://adsabs.harvard.edu/abs/1998MNRAS.298...33R
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