Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....71..366t&link_type=abstract
Astronomy and Astrophysics, vol. 71, no. 3, Jan. 1979, p. 366-368.
Astronomy and Astrophysics
Astrophysics
5
Charge Transfer, Interstellar Gas, Nebulae, Emission Spectra, Gas Ionization, H I Regions, Optical Thickness, Oxygen Spectra
Scientific paper
An investigation is conducted concerning the possibility that double-charge transfer processes may modify significantly the ionization structure of astrophysical plasmas. Calculations are performed of the structure of cosmic gases subjected to a variety of radiation sources chosen to be characteristic of quasars, Seyfert galaxies, planetary nebulae, and the interstellar diffuse X-ray background. It is found that rapid double-charge transfer reactions do not significantly modify ionization equilibria and emission spectra of optically thin gases irradiated by the various ionizing spectra. However, this conclusion is not immediately applicable to optically thick regions. Depending upon the nature of the ionizing spectrum, the fractional abundances of neutral H and He can be very different in the transition zone between H II and H I regions. However, taking into account the given conditions, it is again found that the double-charge transfer has no significant effect.
Dalgarno Alexander
Tarter Bruce C.
Weisheit Jon C.
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