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LMC HII Region Luminosities versus Observed Ionising Stars

Published online by Cambridge University Press:  16 May 2016

M. S. Oey  and
R. C. Kennicutt Jr
M. S. Oey
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK; oey@ast.cam.ac.uk
R. C. Kennicutt Jr
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ 85721, USA; robk@as.arizona.edu
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Abstract

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We use the stellar census of OB associations in the Large Magellanic Cloud (LMC) to predict the Hα 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-ionising photons that escape the local nebulae in this sample. We formally estimate that, overall, 0–51% of the ionising radiation escapes the local HII regions and is available to ionise the warm, ionised 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-typeISM: generalHII regionsMagellanic Clouds
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 15 , Issue 1 , 1998 , pp. 141 - 143
Copyright
Copyright © Astronomical Society of Australia 1998

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