Ionization equilibrium and NLTE effects on compact circumstellar H II regions.

Details Ionization equilibrium and NLTE effects on compact circumstellar H II regions. Ionization equilibrium and NLTE effects on compact circumstellar H II regions.

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994sccha..37..850j&link_type=abstract

Science in China, Series A, Vol. 37, No. 7, p. 850 - 861

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H Ii Regions: Non-Lte Models, H Ii Regions: Infrared Excesses

Scientific paper

This paper presents the results of an extensive set of calculations about ionization equilibrium and NLTE effects on compact circumstellar H II regions embedded in clouds. In the model of a spherically symmetric and isothermal wind with a steady mass loss, pure hydrogen composition as well as Sobolev approximation, the results indicate that compact H II regions are far away from LTE state. The collisional ionization and photoionization from excited levels have great effects on the size of an H II region, the distribution of departure coefficients and the flux ratio of observed spectral lines. They can be used to explain the infrared line excess and the line deficit problems of YSOs.

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