Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6698c&link_type=abstract
HST Proposal ID #6698
Physics
Hst Proposal Id #6698 Interstellar Medium
Scientific paper
Massive stars dynamically interact with their ambient interstellar medium via fast stellar winds during their lifetime and via supernova blasts at their demise. The dynamical interaction causes the physical structure of an HII region to evolve along with its ionizing massive stars. Theoretically, it is expected that HII regions around single massive stars will evolve into wind-blown bubbles, and that HII regions around OB associations will evolve into superbubbles. However, observationally, we have found problems of missing bubbles, missing superbubbles, and missing supernova remnants. To investigate these problems, we request WFPC2 images of {1} two bright compact HII regions encompassing young OB associations to search for bubbles around individual massive stars, {2} a bright compact HII region that contains a supernova remnant but lacks a superbubble structure, and {3} three superbubbles with different levels X-ray emission to search for supernova remnant shocks. The results will help us understand better the roles played by stellar winds and supernova remnants in the structure and evolution of the interstellar medium.
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