Charge exchange of O(3+) with H in planetary nebulae

Details Charge exchange of O(3+) with H in planetary nebulae Charge exchange of O(3+) with H in planetary nebulae

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215..323c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 215, July 15, 1985, p. 323-333. SERC-supported research

Astronomy and Astrophysics

Astronomy

20

Charge Exchange, Hydrogen, Interstellar Chemistry, Oxygen Ions, Oxygen Spectra, Planetary Nebulae, Atomic Excitations, Electron Energy, Fluorescence, Reaction Kinetics, Recombination Coefficient

Scientific paper

New observations of the O III λ5592 Å line in the planetary nebula NGC 3918 are presented. The charge-exchange process involving O3+ and H is modelled in this nebula and in NGC 7662. It is shown that the line is excited mainly by this process when the fraction of hydrogen which is neutral is >10-4. Calculations of excitation rates for fluorescent absorption of starlight by O++ ions are presented. The effective rate coefficient for charge transfer into O III(1P), deduced from detailed models of the nebulae, is within a factor 2 of the theoretical rate k(1P) = 1.6×10-9cm3s-1. An electron temperature for neutral oxygen, Te(O0) = 10000(±1000)K, is obtained for NGC 3918.

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