Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..46..485g&link_type=abstract
Astrophysics and Space Science, vol. 46, Feb. 1977, p. 485-497.
Astronomy and Astrophysics
Astrophysics
5
B Stars, Interstellar Matter, Ionizing Radiation, Magnesium, Photoionization, Background Radiation, High Energy Interactions, Hot Stars, Metal Ions, Stellar Radiation, X Rays
Scientific paper
The paper demonstrates that two concentric ionization zones of interstellar magnesium should exist around every star: an inner zone with a radius coinciding with that of the hydrogen ionization zone and an outer one having a radius an order of magnitude larger. Unlike interstellar hydrogen, interstellar magnesium is found to be ionized everywhere in the Galaxy. It is also shown that ionizing radiation from ordinary hot stars cannot account for the observed high degree of ionization of interstellar magnesium but that this problem can be resolved by postulating the existence of circumstellar clouds or some additional sources of ionization, such as the galactic X-ray background or high-energy nonrelativistic particles. It is concluded that stars of spectral types B5 and B0 play a major role in forming magnesium ionization zones, while the contribution of O-type stars is less than 1%.
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