The ion composition of interstellar gas at 104-105 0K

Astronomy and Astrophysics – Astronomy

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Scientific paper

The results of calculations of the ionization equilibrium of the interstellar gas, affected by diffuse ultraviolet and X-ray radiation, in the temperature range 104 - 105K are presented. It is shown that in this temperature range the charge-transfer reactions play an important role in the ionization balance. Under these conditions the absorption lines of C IV, Si IV and S IV observed in the spectra of nearby stars can be formed. The calculated column densities of N(C IV), N(Si IV), and N(S IV) are in agreement with the observations.

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