Observed Ionizing Stars
M. S. Oey and R. C. Kennicutt, Jr., PASA, 15 (1), 141
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LMC HII Region Luminosities versus
Observed Ionizing Stars
M. S. Oey
and R. C. Kennicutt, Jr.
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, U.K.
oey@ast.cam.ac.uk Steward Observatory, University of Arizona, Tucson, AZ 85721, U.S.A.
robk@as.arizona.edu
Abstract:
We use the stellar census of OB associations in the Large Magellanic Cloud (LMC) to predict the H
luminosities of the host HII regions, based on results from stellar atmosphere models. These values are compared to the observed HII region luminosities, yielding an estimate for the mean fraction of H-ionizing photons that escape the local nebulae in this sample. We formally estimate that, overall, 0-51% of the ionizing radiation escapes the local HII regions and is available to ionize the warm, ionized medium in the LMC. We find both nebulae that appear to be density-bounded, and ones that appear to be radiation-bounded.
Keywords: stars: early-type - ISM: general - HII regions - Magellanic Clouds
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