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Some Atomic Parameters Pertinent to Studies of Nebular Ionized Plasmas

Published online by Cambridge University Press:  30 March 2016

Lawrence H. Aller
Lawrence H. Aller*
Affiliation:
Astronomy Department, University of California, Los Angeles, CA, USA

Extract

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In order to predict emission line and continuum intensities and assess plasma diagnostics for gaseous nebulae, it is necessary to have accurate atomic parameters. In some Instances the requirements for accuracy are very severe. A variety of data is required:

  1. 1) Coefficients of continuous absorption;

  2. 2) Direct and dielectronic recombination coefficients;

  3. 3) Transition probabilities for permitted lines, so we can accurately predict both recombination line intensities and fluorescent phenomena (e.g., OI λ8446);

  4. 4) Transition probabilities for forbidden and intercombination lines;

  5. 5) Collision cross sections for levels which give rise to:

    1. a) resonance transitions,

    2. b) intercombination lines,

    3. c) forbidden lines;

  6. 6) Charge-exchange cross sections.

Type
Joint Commission Meetings
Information
Highlights of Astronomy , Volume 6: Highlights of Astronomy. As presented at the XVIIIth General Assembly of the IAU, 1982 , 1983 , pp. 791 - 793
Copyright
Copyright © Reidel 1983

References

Czyzak, S.J. and Krueger, T.K.: 1963, Mon. Not. Roy. Astron. Soc. 126, p. 177.CrossRefGoogle Scholar
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Czyzak, S.J.: 1982, private communication.Google Scholar
Mendoza, C. and Zeippen, C.J.: 1982, Mon. Not. Roy. Astron. Soc. 198, p. 127.CrossRefGoogle Scholar
Zeippen, C.J.: 1982, Mon. Not. Roy. Astron. Soc. 198, p. 111.CrossRefGoogle Scholar