Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103.1182a&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Nov. 1991, p. 1182-1186.
Astronomy and Astrophysics
Astronomy
37
Gas Ionization, H Ii Regions, Neon, Orion Nebula, Oxygen Ions, Oxygen Spectra, Cosmic Dust, Hydrogen Ions, Nuclear Fusion
Scientific paper
The usefulness of the Ne III-O II forbidden-line spectrum as a helium ionization correction factor (ICF) indicator in low-density nebulae, such as H II regions, is examined, and the results of an extensive grid of photoionization simulations which have a 'blister'-like geometry are presented. Fully filled constant pressure gas, Orion dust, and H II region abundances are used, along with a very wide variety of ionizing continua. As suggested by the ionization potentials, the He ICF is small when the Ne III 3869/O II 3727 forbidden line ratio, an easily measured line pair, reaches above 0.20. The 'eta' parameter, a ratio of ratios of oxygen and sulfur lines, is probably strongly affected by low-temperature dielectronic recombination, a basic process which has no reliable rate coefficients for third-row elements.
Ali Babar
Blum Robert David
Bumgardner T. E.
Cranmer Steven R.
Ferland Gary J.
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