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Title:
Noncollisional excitation of low-lying states in gaseous nebulae
Authors:
Rubin, Robert H.
Affiliation:
AA(NASA, Ames Research Center, Moffett Field, CA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 334-341. (ApJ Homepage)
Publication Date:
10/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Atomic Energy Levels, Atomic Excitations, Electron Recombination, Metastable State, Nebulae, Abundance, Carbon, Forbidden Transitions, Nitrogen Atoms, Orion Nebula, Oxygen Atoms, Radiative Recombination
DOI:
10.1086/164606
Bibliographic Code:
1986ApJ...309..334R

Abstract

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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