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Paper: The Evolution of Dust and Infrared Radiation in HII Regions
Volume: 510, Stars: From Collapse to Collapse
Page: 98
Authors: Topchieva, A.; Wiebe, D.; Kirsanova, M.; Krushinsky, V.
Abstract: Regions of ionized hydrogen are often observed in infrared (IR) emission as ring-like nebulae. IR emission presumably comes from hot dust embedded in ionized gas and surrounding the ionized gas. The dust within these regions is believed to be partially blown away by the action of both the stellar wind and radiation pressure from young massive stars. We investigate trends in morphology of IR ring nebulae representing HII regions. Archival data from VLA New GPS 20 cm survey as well as from Spitzer GLIMPSE and MIPSGAL surveys at 8 and 24 micron are utilized to select visually objects with more or less regular shapes. We have identified 92 HII regions surrounded by closed or nearly closed IR rings. Shapes of these rings are characterized by fitting ellipses in order to estimate their orientation and oblateness. From our catalogue of 92 objects we have selected 27 objects with eccentricities of fitted ellipses less than 0.3. These objects are suggested as prototype targets for 1D hydrodynamic modeling.
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