NE III charge-exchange lines in the planetary nebula NGC 3918

Details NE III charge-exchange lines in the planetary nebula NGC 3918 NE III charge-exchange lines in the planetary nebula NGC 3918

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221p..61c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 1, 1986, p. 61P-67P. SERC-supported research.

Astronomy and Astrophysics

Astronomy

14

Charge Exchange, Line Spectra, Neon, Planetary Nebulae, Reaction Kinetics, Astronomical Models, Astronomical Spectroscopy, Hydrogen, Neutral Gases, Photoionization

Scientific paper

The detection of Ne III triplet and quintet lines near 2600 Å in the planetary nebula NGC 3918 is reported. They are excited mainly by charge-transfer reactions between Ne3+ and H0. Empirical reaction rates for triplet and quintet exit channels, deduced from a photoionization model of the nebula and the line strengths, are within a factor 2 of the theoretical rates. The relative strengths of O III singlet and triplet charge-transfer lines in NGC 3918 are also compared with theoretical calculations.

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