Atomic structure calculations and nebular diagnostics

Details Atomic structure calculations and nebular diagnostics Atomic structure calculations and nebular diagnostics

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...61..159c&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 61, May 1986, p. 159-175.

Astronomy and Astrophysics

Astrophysics

65

Astronomical Spectroscopy, Atomic Spectra, Nebulae, Stellar Envelopes, Transition Probabilities, Atomic Structure, Forbidden Transitions, Line Spectra, Symbiotic Stars, Wave Equations

Scientific paper

Considerable differences in predicted transition probabilities and collision strengths can result from differing wave-function choices. For the [O III] λ5007/λ4959 ratio, precise theoretical predictions range from 2.88 to 2.90; the mean photoelectrically observed value (45 nebulae) is 2.98±0.07 p.e. Theory and observation seem to agree for A-value ratios in nebular-type transitions of [N I], [O II], [S II], and possibly [Cl III]. Line-ratio diagrams are presented for various ions of interest in nebular plasma diagnostics.

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