The ionization structure of helium in H II region complexes

Details The ionization structure of helium in H II region complexes The ionization structure of helium in H II region complexes

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98.1061p&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Oct. 1986, p. 1061-1065.

Astronomy and Astrophysics

Astronomy

18

Abundance, Gas Ionization, H Ii Regions, Photoionization, B Stars, Helium, O Stars

Scientific paper

Ionization structure models of H II regions are constructed to analyze the behavior of the helium ionization correction factor, icf, for combinations of different stellar radiation fields as well as for mixtures of individual H II regions of different degrees of ionization. It is found that the amount of neutral He is less than 3 percent and that icf is between 0.98 and 1.00, for H II region coomplexes ionized by OB associations where the hottest stars are earlier than O6, if the ionizing stars are distributed according to a normal IMF. This result applies for a single H II region or for a mixture of unconnected H II regions. This result implies that the He(+)/H(+) ratio observed in extragalactic H II regions of high degree of ionization corresponds to the true He/H abundance ratios.

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