The volumes of He(+) and H(+) in H II regions - The Orion Nebula

Details The volumes of He(+) and H(+) in H II regions - The Orion Nebula The volumes of He(+) and H(+) in H II regions - The Orion Nebula

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..91..381c&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 91, no. 2, April 1983, p. 381-394. Research supported by the Conselho Naci

Astronomy and Astrophysics

Astrophysics

9

H Ii Regions, Helium Ions, Hydrogen Ions, Interstellar Matter, Orion Nebula, Density Distribution, Ionizing Radiation, Main Sequence Stars, Photons

Scientific paper

The authors obtain ratios of volumes of He+ to H+ zones for H II regions ionized by associations following a Salpeter IMF using Kurucz's (1979) model atmospheres. It is concluded that the temperature of the hottest star in the association is the dominant factor determining the He ionization structure. The selective dust absorption seems to play a secondary role as well as density gradients and spatial distribution of ionizing stars. The results are compared with observations, in particular with the Orion Nebula. A density gradient is found in M42. Filling factors in the range ø ≅ 8-10 for M42 and ø ≅ 5-16 for M43 are obtained.

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