Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4853w&link_type=abstract
HST Proposal ID #4853
Physics
Hst Proposal Id #4853
Scientific paper
Much of the scientific utility of narrow band imaging of nebulae lies in the study of stratification and structural variations among emission lines that trace regions of different density, temperature, and radiation environment. As such, imaging studies of nebulae are not as seriously affected by HST's optical problems as many programs, so long as adequate signal to noise is obtained to allow reliable deconvolution of the structure present. For nearby objects, HST can resolve physically important scales associated with many gasdynamic and radiative processes in the ISM. In the present proposal, we: 1) extend our study of the physical processes in H II regions to two additional regions (NGC 7635 and M 16), with specific goals to study the interface between the H II region and the adjoining photodissociation region, and the interaction between the radiation field and dense clumps of material, and 2) obtain images of two fields in M 33 to start the process of applying our understanding of the structure and physics of Galactic H II regions to the ISM in external galaxies.
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