Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.5120d&link_type=abstract
HST Proposal ID #5120
Other
Hst Proposal Id #5120
Scientific paper
Extensive imagery and spectroscopic observations of the DUSTY SMC HII region N88A (Henize 1956 catalog) are proposed with HST in order to study its UV-optical spectrum (FOS), the morphology of its gas and dust (WFC & FOC), and the characteristics of the surrounding stellar population (WFC). This object is unique among the HII region population of the SMC in that it contains significant amounts of internal dust and shows a very stratified ionization structure and spectrum. By virtue of its high surface brightness and small angular size, it is particularly well suited for the high spatial resolution imagery and combined UV-optical spectroscopic capabilities of HST. From these observations we will model both the ionized gas and dust in N88A in detail. These models will provide fundamental information regarding the nature and origin of the dust and its effect on the composition and physical conditions of the ionized gas local to N88A and the fainter nebulosities surrounding it. Similar observations of another compact SMC HII region, N81, will provide a compariso n. SMC N81 does not contain any internal or surrounding dust, but has a very high surface brightness and similar single-star ionizing source, making it particularly suitable for modeling and for comparisons with N88A. This study should have wide importance related to the nature and origin of dust in the ISM of metal-poor irregular galaxies.
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