Abstract
It has been shown that two concentric ionization zones of interstellar magnesium must exist around each star: internal, with a radius coinciding with that of the zone of hydrogen ionizationS H; and external, with a radius greater thanS H, by one order. Unlike interstellar hydrogen, interstellar magnesium is ionized throughout the Galaxy. It also transpires that the ionizing radiation of ordinary hot stars cannot provide for the observed high degree of ionization of interstellar magnesium. The discrepance can be eliminated by assuming the existence of circumstellar clouds or additional ionization sources of interstellar magnesium (X-ray background radiation, high-energy particles, etc.). Stars of the B5 and B0 class play the main role in the formation of ionization zones of interstellar magnesium; the contribution of O class stars is negligible (<1%).
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Allen, C. W.: 1973,Astrophysical Quantities (3rd Ed.), Athlone Press, London.
Bless, R. C. and Savage, B. D.: 1972,Astrophys. J. 171, 293.
Boksenberg, A., Kirkham, B., Pettini, M., Bates, B., Carson, P. P. D., Duften, P. L., and McKeith, C. D.: 1975,Astrophys. J. Letters 202, L91.
Boksenberg, A., Kirkham, B., Towlson, W. A., and Venis, T. E.: 1972,Nature Phys. Sci. 240, 127.
Jenkins, E. B.: 1974, private communication.
Morton, D. C.: 1975,Astrophys. J. 197, 85.
Morton, D. C., Drake, J. F., Jenkins, E. B., Rogerson, J. B., Spitzer, L., and York, D. G.: 1973,Astrophys. J. Letters 181, L103.
Morton, D. C. and Hu, E. M.: 1975,Astrophys. J. 202, 638.
Rogerson, J. B., York, D. C., Drake, J. F., Jenkins, E. B., Morton, D. C., and Spitzer, L.: 1973,Astrophys. J. Letters 181, L110.
Steigman, G., Strittmatter, P. A., and Williams, R. E.: 1975,Astrophys. J. 198, 575.
Strömgren, B.: 1939,Astrophys. J. 89, 526.
Tarter, C. B.: 1971,Astrophys. J. 168, 313.
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Gurzadyan, G.A. On the ionization of interstellar magnesium. Astrophys Space Sci 46, 485–497 (1977). https://doi.org/10.1007/BF00644392
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DOI: https://doi.org/10.1007/BF00644392