Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6623g&link_type=abstract
HST Proposal ID #6623
Other
Hst Proposal Id #6623 Interstellar Medium
Scientific paper
The H II region N44C in the LMC is peculiar in that it exhibits unusually strong nebular recombination emission from He II, indicating a hard radiation field. However, the ionizing star appears to be a normal O star. Stellar atmosphere models from the Munich group suggest that a hot O supergiant could provide the ionizing power, but the observed spectral type is quite uncertain because of contamination of the optical spectrum by strong nebular emission. Other possible mechanisms include fast shocks or an X-ray binary {possibly fossil} ionizing the nebula. We propose to study this peculiar nebula via {1} GHRS+G160L spectroscopy to determine the spectral type of the ionizing star and its physical properties; {2} FOS spectroscopy of the brightest emission knot, to measure high-ionization UV emission lines of nitrogen, carbon, and oxygen. The UV lines will provide diagnostics on the hardness of the ionizing spectrum and whether C and N are enriched in the nebula {which would indicate the influence of an evolved star}. {3} WFPC2 imaging in HAlpha, O III, and continuum to study the interaction of the ionizing star with the nebula gas, and to look for filamentary structure indicative of shocks and any additional stellar components not resolved from the ground. Detailed study of this nebula and the associated O star provide a unique test of state-of-the-art atmosphere models for hot stars.
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