Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...76..985e&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 76, July 1991, p. 985-999.
Astronomy and Astrophysics
Astrophysics
20
Atmospheric Ionization, Atmospheric Models, H Ii Regions, Photoionization, Stellar Atmospheres, Abundance, Metallicity, Nonequilibrium Thermodynamics, Thermodynamic Equilibrium
Scientific paper
Several grids of theoretical H II region models are computed by photoionization modeling in order to determine the extent to which the choice of the ionizing stellar atmosphere model affects the calibration of emission-line diagnostic diagrams of Evans and Dopita (1985) and the semiempirical H II region abundance sequence calibration of Evans and Dopita. Emission-line diagnostic diagrams are presented and compared for model nebulae ionized by Hummer and Mihalas (1970) unblanketed LTE atmospheres, Kurucz (1979) line-blanketed LTE atmospheres, Mihalas (1972) unblanketed non-LTE, and a truncated blackbody spectrum. The models demonstrate that for solar nebular and atmospheric abundances, there are only minor differences between H II models ionized by the Hummer and Mihalas atmospheres. The unblanketed non-LTE stellar atmosphere models of Mihalas and truncated blackbody spectra are shown to be unsuitable for general H II region modelling.
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