Ultraviolet spectra of planetary nebulae. VIII. The C/O abundance ratio in the ring nebula.
Abstract
The Ring nebula (NGC 6720) has been observed with the International Ultraviolet Explorer satellite. Measurements of line intensities at a position on the ring, offset from the central star, lead to a value of the abundance ratio C/O approximately 1.2, a result which is insensitive to the adopted value of the electron temperature in the nebula.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 1982
- DOI:
- 10.1093/mnras/199.1.15P
- Bibcode:
- 1982MNRAS.199P..15F
- Keywords:
-
- Abundance;
- Carbon;
- Oxygen Ions;
- Planetary Nebulae;
- Ultraviolet Astronomy;
- Ultraviolet Spectra;
- Electron Energy;
- Iue;
- Line Spectra;
- Spectral Line Width;
- Astrophysics