Distribution of forbidden neutral carbon emission in the ring nebula (NGC 6720)

Details Distribution of forbidden neutral carbon emission in the ring nebula (NGC 6720) Distribution of forbidden neutral carbon emission in the ring nebula (NGC 6720)

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..683j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 15, 1983, p. 683-688.

Astronomy and Astrophysics

Astrophysics

11

Carbon, Emission Spectra, Forbidden Transitions, Neutral Atoms, Planetary Nebulae, Spatial Distribution, Ionization Potentials, Ionizing Radiation, Line Spectra, Ultraviolet Radiation

Scientific paper

The spatial distribution of forbidden C I 9823, 9850 A emission in NGC 6720 is reported. Like forbidden O I, the forbidden C I radiation appears enhanced in the region of the bright filaments. A few percent of the carbon atoms in the filaments are neutral. The neutral fraction is consistent with ionization equilibrium calculations made under the assumption of complete shielding of direct stellar radiation by hydrogen. The observed carbon lines are excited by photoelectrons produced from hydrogen by the nebular diffuse radiation field. The forbidden C I observations confirm that the filaments in NGC 6720 are regions of locally enhanced shielding.

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