Theoretical models for H II regions. I - Diagnostic diagrams

Details Theoretical models for H II regions. I - Diagnostic diagrams Theoretical models for H II regions. I - Diagnostic diagrams

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apjs...58..125e&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 58, May 1985, p. 125-142.

Astronomy and Astrophysics

Astrophysics

159

Abundance, Astronomical Models, H Ii Regions, Interstellar Chemistry, Photoionization, B Stars, Diagrams, Emission Spectra, Metallicity, O Stars

Scientific paper

Systematic modelling techniques employing the latest atomic data are used to compute a comprehensive grid of model H II regions, covering a wide range of physical conditions and comprising a total of 211 independent models. Theoretical diagnostic diagrams for the H II regions are constructed, and it is shown that these diagrams can be employed to determine the metallicity and ionization parameter of an observed H II region and the ionization temperature of the exciting star or stars. To check the modelling procedure, theoretical loci for H II regions are generated on the three principal excitation diagrams of Baldwin, Phillips, and Terlevich (1981), and it is demonstrated that the theoretical models agree with the observed positions of H II regions on these diagrams.

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