Theoretical models for H II regions. II-The extragalactic H II region abundance sequence
MA Dopita, IN Evans - … Journal, Part 1 (ISSN 0004-637X), vol …, 1986 - adsabs.harvard.edu
With the aid of an extensive homogeneous grid of theoretical photoionization models (Evans
and Dopita, 1985), a multiline fit to the observed emission-line spectral sequence of
extragalactic H II regions is generated. It is possible to produce an excellent fit between the
(rather narrow) emission-line ratio sequences that are observed and the theoretical
sequences, provided that the average ionization parameter is strongly coupled with
metallicity, and provided that nitrogen is a product of secondary nucleosynthesis. Using this …
and Dopita, 1985), a multiline fit to the observed emission-line spectral sequence of
extragalactic H II regions is generated. It is possible to produce an excellent fit between the
(rather narrow) emission-line ratio sequences that are observed and the theoretical
sequences, provided that the average ionization parameter is strongly coupled with
metallicity, and provided that nitrogen is a product of secondary nucleosynthesis. Using this …
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