Astronomy and Astrophysics – Astrophysics
Scientific paper
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.
Beck Sara C.
Geballe Thomas Ronald
Lacy John H.
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