Ionization and abundances in the Dumbbell nebula.
Abstract
We present line intensities measured at six positions in the Dumbbell nebula exhibiting a wide range of ionization. At each position the electron density, temperatures, and ionic abundances of helium, oxygen, nitrogen, neon, and sulfur are computed. We estimate the total abundances of nitrogen, neon, and sulfur by assuming that the oxygen ionization distribution is a good guide to the ionization distribution of these other elements. The agreement of the total abundances in the six positions indicates that this is a good assumption for nitrogen and sulfur, but not for neon. I(lambda 3869) increases with I(lambda 3727) implying that Ne(++) evidently coexists with O(+) in the low ionization regions.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- February 1978
- DOI:
- Bibcode:
- 1978PASP...90...39H
- Keywords:
-
- Abundance;
- Ionization;
- Line Spectra;
- Planetary Nebulae;
- Astronomical Spectroscopy;
- Electron Density (Concentration);
- Helium;
- Neon;
- Nitrogen;
- Oxygen Spectra;
- Radiant Flux Density;
- Sulfur;
- Astrophysics;
- Electron Densities:Planetary Nebulae;
- Element Abundances:Planetary Nebulae;
- Ionization:Planetary Nebulae;
- Line Intensities:Planetary Nebulae