Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2466..247u&link_type=abstract
Star formation in galaxies, Proceedings of a conference at the California Institute of Technology, Pasadena, California, June 16
Astronomy and Astrophysics
Astronomy
1
Energy Distribution, H Ii Regions, Luminosity, Lyman Alpha Radiation, Magellanic Clouds, Nebulae, Star Formation, Absorption Spectra, Abundance, Balmer Series, Emission Spectra, Infrared Astronomy Satellite, Temperature Measurement, Ultraviolet Radiation
Scientific paper
The infrared excess (IRE) of the Large Magellanic Cloud (LMC) HII nebulae is found to correlate positively with the temperature of the ambient radiation field or with the He(+)/H(+) abundance ratio. This result is discussed in terms of a selective absorption of the photons in the range 504 to 912 A relative to the He ionizing photons. This interpretation may explain the paradox of finding highly excited nebulae with only relatively moderate equivalent width of their Balmer lines.
Ungerer V.
Viallefond Francois
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