Electron densities for 10 planetary nebulae derived from the CIII 1907/1909 ratio. II.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1981
- DOI:
- 10.1086/158975
- Bibcode:
- 1981ApJ...246..807F
- Keywords:
-
- Astronomical Spectroscopy;
- Carbon;
- Electron Density (Concentration);
- Forbidden Transitions;
- Planetary Nebulae;
- Ultraviolet Spectra;
- Abundance;
- Ions;
- Iue;
- Signal To Noise Ratios;
- Ultraviolet Astronomy;
- Astronomy