Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986kfnt....2...21s&link_type=abstract
Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 2, Mar.-Apr. 1986, p. 21-26. In Russian.
Astronomy and Astrophysics
Astronomy
Interstellar Chemistry, Interstellar Gas, Ion Density (Concentration), Ionized Gases, Ionizing Radiation, Abundance, Astronomical Models, Gas Composition, H Ii Regions, Ion Charge, Nonequilibrium Ionization, Stellar Radiation
Scientific paper
An analysis is made of the formation and relaxation of the ion composition of interstellar gas at 10 to the 4th K in the vicinity of a nonstationary source of ionizing radiation. The relative concentrations of the high-charge ions C IV, N V, O VI, Si III, Si IV, and Si VI in a nonstationary H II zone are calculated as a function of time for simple models with instantaneous switching on and off of the source. Approximate formulas relating to the parameters of the nonstationary H II region to the source power and the time elapsed after switching on are presented.
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