Circumstellar envelopes of hot stars: Formation of extended regions of weakly ionized gas

Details Circumstellar envelopes of hot stars: Formation of extended regions of weakly ionized gas Circumstellar envelopes of hot stars: Formation of extended regions of weakly ionized gas

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006arep...50..451b&link_type=abstract

Astronomy Reports, vol. 50, Issue 6, p.451-457

Astronomy and Astrophysics

Astronomy

Pacs Numbers 97.20.E - 98.38.B

Scientific paper

We propose a model explaining the presence of vast regions of partially ionized gas in the interstellar medium. The circumstellar envelope of a hot star absorbs soft ionizing radiation, but transmits an appreciable fraction of the hard photons, which are absorbed much more weakly than photons with energies close to the ionization limit. For this reason, the radiation attenuated by the envelope becomes harder, and can penetrate to larger distances. For stars hotter than 50 000 K, the transition zone between the ionized and neutral gas can extend to tens or hundreds of parsecs. Thus, a region of partially ionized hydrogen, with a small gradient of the degree of ionization without a well-defined inner HII zone, can form in the interstellar medium.

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