Ion-atom charge-transfer reactions and a hot intercloud medium

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atomic Collisions, Carbon, Charge Transfer, Interstellar Matter, Ionic Reactions, Abundance, Hydrogen Clouds, Interstellar Space, Radiative Recombination, Spaceborne Astronomy, Stellar Spectra

Scientific paper

An investigation is conducted concerning the ionization equilibrium of carbon in a hot intercloud medium (ICM), taking into account various charge-transfer reactions. Attention is given to problems related to observations of carbon along the lines of sight to several unreddened stars. It is pointed out that the observed underabundance of C III and overabundance of C I can be consistent with the presence of a hot, partially ionized ICM, provided that two of the charge-transfer reactions considered are rapid at thermal energies.

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