Electron densities for 10 planetary nebulae derived from the semiforbidden C III lambda 1907/1909 ratio. II

Details Electron densities for 10 planetary nebulae derived from the semiforbidden C III lambda 1907/1909 ratio. II Electron densities for 10 planetary nebulae derived from the semiforbidden C III lambda 1907/1909 ratio. II

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..807f&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, June 15, 1981, p. 807-809.

Astronomy and Astrophysics

Astronomy

20

Astronomical Spectroscopy, Carbon, Electron Density (Concentration), Forbidden Transitions, Planetary Nebulae, Ultraviolet Spectra, Abundance, Ions, Iue, Signal To Noise Ratios, Ultraviolet Astronomy

Scientific paper

Electron densities for IC 351, IC 2165, J900, IC 3568, NGC 6644, NGC 6891, IC 4997, NGC 7009, Hu 1-2, and IC 5217 are derived from high-dispersion semiforbidden C III spectrograms. For seven of these nebulae, the derived electron density is larger than the values derived from either surface brightness measurements or forbidden line ratios. Only one object, Hu 1-2, shows pronounced splitting of the semiforbidden C III emission lines due to a large expansion velocity.

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