Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..39..321b&link_type=abstract
Astrophysics and Space Science, vol. 39, Feb. 1976, p. 321-334.
Astronomy and Astrophysics
Astronomy
19
B Stars, Interstellar Gas, Interstellar Radiation, Ultraviolet Radiation, Abundance, Astronomical Models, Helium, Hydrogen, Mass Ratios, Oao 3, Radiation Distribution, Spaceborne Astronomy, Ultraviolet Spectrometers
Scientific paper
Adopting a smeared-out interstellar UV radiation field originating from B-stars as the main interstellar ionization source, data from the Copernicus satellite is used to determine the interstellar radiation field and the resulting ionization ratios of the elements. Contrary to earlier studies which assumed a radiation temperature of 11,000 K, it is shown that lower temperatures are more consistent with the observations. It is also shown that the ratio of neutral interstellar helium to neutral interstellar hydrogen is likely to be 2 to 3 times as large as the cosmic abundance of these elements. If the radiation temperature were as high as 9000 K, this ratio could come close to unity. The result of this increased helium density would be an increase in the expected background radiation of He 584 angstroms.
Blum Peter W.
Fahr Hans Jörg
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