Radiative transfer calculations for the C 4 Lambda 155 MM resonance lines in planetary nebulae

Details Radiative transfer calculations for the C 4 Lambda 155 MM resonance lines in planetary nebulae Radiative transfer calculations for the C 4 Lambda 155 MM resonance lines in planetary nebulae

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..317k&link_type=abstract

In ESA 3rd European IUE Conf. p 317-321 (SEE N83-11889 02-88)

Mathematics

Carbon, Planetary Nebulae, Radiative Transfer, Resonance Lines, Atmospheric Ionization, Cosmic Dust, Iue, Mathematical Models, Stellar Luminosity, Ultraviolet Absorption

Scientific paper

Ionization models for NGC 6210, 7009, 3242 and II 2003 were constructed from optical and IUE spectral data. The predicted CIV 155 nm resonance line is about 10 times stronger than observed. Radiative transfer calculations of the CIV lines in a spherical nebula, assuming partial frequency redistribution, were made to investigate the effects of dust absorption and an additional depopulation of the upper level. Neither effect explains the CIV discrepancy. Factors affecting the ionization balance (atomic parameter, ionizing radiation field) seem more promising.

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