Infrared emission line studies of the structure and excitation of H II regions

Details Infrared emission line studies of the structure and excitation of H II regions Infrared emission line studies of the structure and excitation of H II regions

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..510l&link_type=abstract

Astrophysical Journal, Part 1, vol. 255, Apr. 15, 1982, p. 510-523. NASA-NSF-supported research.

Astronomy and Astrophysics

Astrophysics

40

H Ii Regions, Infrared Spectra, Nebulae, Stellar Evolution, Abundance, Angular Resolution, Astronomical Maps, Emission Spectra, Fine Structure, Ionizing Radiation, Line Spectra, Stellar Spectra

Scientific paper

Maps of five H II regions in one or more of the infrared fine-structure lines of Ne II (12.8 microns), Ar III (9.0 microns), and S IV (10.5 microns) have been obtained with angular resolutions ranging from 4 to 7 arcsec. The observations are used to discuss the morphology and excitation of these nebulae. Considerable diversity is found in the structures of the nebulae, probably resulting from differences in their ages and the circumstances of their formation. In all cases, more ionizing luminosity than would be provided by a single dominant ionizing star appears to be required, although uncertainties in the model nebulae make this conclusion uncertain.

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