Emission lines of MG II and CA II in planetary nebulae

Details Emission lines of MG II and CA II in planetary nebulae Emission lines of MG II and CA II in planetary nebulae

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979afz....15..461g&link_type=abstract

(Astrofizika, vol. 15, July-Sept. 1979, p. 461-472.) Astrophysics, vol. 15, no. 3, Jan. 1980, p. 310-316. Translation.

Astronomy and Astrophysics

Astrophysics

1

Calcium, Emission Spectra, Line Spectra, Magnesium, Planetary Nebulae, Electron Scattering, Forbidden Bands, Ionization

Scientific paper

Conditions of excitation of the emission resonance lines of ionized magnesium and calcium in planetary nebulae are analyzed. The allowed lines are excited by the same mechanism as the forbidden lines and not by ordinary fluorescence. An emission line lambda 2800 Mg II of reasonable strength can be observed in the spectra of planetary nebulae of medium excitation, but not in highly excited nebulae. The absence of the H and K emission lines of Ca II in the spectra results from their expected intensity which is 3 to 4 orders of magnitude lower than the intensity of the line lambda 2800 Mg II or H(beta) of hydrogen.

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