On the extent of departures from equilibrium in weak D-type ionization fronts

Details On the extent of departures from equilibrium in weak D-type ionization fronts On the extent of departures from equilibrium in weak D-type ionization fronts

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179...63h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 179, Apr. 1977, p. 63-79. Research supported by the Science Research Co

Astronomy and Astrophysics

Astronomy

12

Astronomical Models, Gas Ionization, Hydrogen Clouds, Steady Flow, Chemical Composition, Continuity Equation, Emission Spectra, Gas Flow, Hydrogen Ions, Ionization Cross Sections, Line Spectra, Photoionization, Planetary Nebulae, Propagation Velocity

Scientific paper

The detailed behavior of gas flowing through a weak D-type ionization front has been calculated under the assumption that the flow is steady. Results are presented for the cases of ionizing stars with effective temperatures of 38,000 and 50,000 K as well as for flow velocities up to 11 km/s. It is found that the maximum temperature within the ionization front never exceeds the equilibrium value by more than 1000 K. The emission line spectra have been computed and are found to be quite similar to the spectra of static equilibrium ionization fronts.

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