N III line emission in planetary nebulae - Not Bowen fluorescence

Details N III line emission in planetary nebulae - Not Bowen fluorescence N III line emission in planetary nebulae - Not Bowen fluorescence

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381l..59k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 381, Nov. 10, 1991, p. L59-L62.

Other

11

Emission Spectra, Fluorescence, Line Spectra, Nitrogen, Planetary Nebulae, Seyfert Galaxies, Astronomical Photometry, Molecular Energy Levels, Molecular Excitation, Recombination Reactions

Scientific paper

A direct comparison of photometrically observed line ratios in the N III 4640 and 4100 A multiplets emitted by planetary nebulae with theoretically predicted ratios expected from the postulated Bowen process of selective photoexcitation by an O III resonance line shows that the N III lines are not produced by the Bowen process as has been commonly accepted. This will have consequences for the interpretation of these lines in other astrophysical sources. A further, unexpected result is that the N III level populations involved are found to be essentially in statistical equilibrium. Possible populating mechanisms are briefly discussed.

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