On the effects of inhomogeneities in high excitation H II regions

Details On the effects of inhomogeneities in high excitation H II regions On the effects of inhomogeneities in high excitation H II regions

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..53..479m&link_type=abstract

Astrophysics and Space Science, vol. 53, no. 2, Feb. 1978, p. 479-487.

Astronomy and Astrophysics

Astrophysics

Gas Ionization, H Ii Regions, Inhomogeneity, Planetary Nebulae, Recombination Reactions, Emission Spectra, Holes (Electron Deficiencies), Hydrogen Ions, Iterative Solution, Stellar Models

Scientific paper

The hypothesis that observations of inhomogeneities in H II regions would be changed by adopting a filling factor other than one is investigated by comparing models of H II regions with filling factors of one and one eighth. Attention is given to conditions when the hydrogen and helium fronts are close together, i.e. high excitation H II regions. Results obtained through use of an iterative scheme, whereby the nebula is divided into concentric shells with variable thickness, indicate that some emission lines, e.g., O II, S II, S III, N II, are substantially altered when the filling factor is smaller than one

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