Ultraviolet spectra of planetary nebulae. VII. The abundance of carbon in the very low excitation nebula HE 2-131.
Abstract
Features observed in infrared spectra suggest that certain very low excitation (VLE) nebulae have low C/O abundance ratios (Cohen & Barlow 1980; Aitken & Roche 1982). Fluxes in the multiplets [O II] sun2470 and [O II] λ2326 have been measured for the VLE nebula He 2-131 = HD 138403 using lUE high-dispersion spectra. An analysis similar to that of Harrington et al. (1980) for IC 418 gives C/O = 0.3 for He 2-131, compared with C/O = 1.3 for IC 418 and 0.6 for the Sun.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- July 1982
- DOI:
- 10.1093/mnras/200.1.7P
- Bibcode:
- 1982MNRAS.200P...7A
- Keywords:
-
- Abundance;
- Astronomical Spectroscopy;
- Carbon;
- Planetary Nebulae;
- Ultraviolet Astronomy;
- Fine Structure;
- Forbidden Transitions;
- Iue;
- Oxygen Spectra;
- Ratios;
- Astronomy