Ionization correction factors and compositions of H II regions

Details Ionization correction factors and compositions of H II regions Ionization correction factors and compositions of H II regions

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245..625m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 2, May 1991, p. 625-634.

Astronomy and Astrophysics

Astrophysics

42

Cosmochemistry, H Ii Regions, Interstellar Matter, Chemical Composition, Ionization Coefficients

Scientific paper

The determination of ionization correction factors (ICFs) is discussed by means of a grid of new photoionization models for H II regions, mainly using the plane-parallel model stellar atmospheres of Kurucz (1979). The ionic abundances of the models are integrated either over the nebular volume or along a radius. The observations of the Orion Nebula do not lie along a single atmospheric track, which is interpreted as the effects of good spatial resolution. Observations of less well-resolved nebulae (30 Dor and NGC 604) show fairly good agreement with a Kurucz T(asterisk 3) = 42 track. Observations of NGC 5471 in M101 also suggest a track that is 'hotter' than any Kurucz atmosphere. The chemical compositions of H II regions are compatible with those found in unevolved stars.

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