Noncollisional excitation of low-lying states in gaseous nebulae

Details Noncollisional excitation of low-lying states in gaseous nebulae Noncollisional excitation of low-lying states in gaseous nebulae

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..334r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 334-341.

Astronomy and Astrophysics

Astrophysics

50

Atomic Energy Levels, Atomic Excitations, Electron Recombination, Metastable State, Nebulae, Abundance, Carbon, Forbidden Transitions, Nitrogen Atoms, Orion Nebula, Oxygen Atoms, Radiative Recombination

Scientific paper

It is found that low-lying metastable levels in some species traditionally treated as being excited by electron collisions may also be significantly populated by recombination processes. This is predominantly due to a large effective dielectronic recombination coefficient to these levels as well as direct radiative recombinations to these levels. Low-excitation states of the various ionic species of C, N, and O are examined. By far the most dramatic change among the forbidden lines occurs for the [O II] lines. Implications for O and C abundance determinations in H II regions and planetary nebulae are discussed.

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