Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198l..31e&link_type=abstract
Astrophysical Journal, vol. 198, May 15, 1975, pt. 2, p. L31-L35.
Astronomy and Astrophysics
Astrophysics
30
Background Radiation, Early Stars, Galactic Radiation, H Alpha Line, Astronomical Maps, B Stars, Electron Density (Concentration), Gas Ionization, Hydrogen Clouds, Interstellar Matter, O Stars, Stellar Radiation
Scientific paper
The isolated H alpha emission features reported by Reynolds et al. are identified with Stroemgren spheres surrounding observed O stars; the root mean square electron densities and Stroemgren radii are calculated from the observed emission measure and stellar type. The density has an average value of 2 per cu cm but increases to 3.3 per cu cm for stars within 200 pc of the galactic plane. An analysis of the Catalogue of Galactic O Stars shows that enhanced H alpha emission is observed around all known O stars. The diffuse component of H alpha emission is what one would expect from the line-of-sight overlapping of isolated Stroemgren spheres surrounding B stars and appears to correlate with features on extinction maps, as derived. There is no compelling reason to suggest any large-scale intercloud ionization from H alpha data alone.
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