Ultraviolet spectra of planetary nebulae. I. The abundance of carbon in IC 418.
Abstract
IUE observations of IC 418 give fluxes in the lines C III λ1908, C II] λ2326, [O II] λ2470 and Mg II λ2800. Fluxes on the scale of F(Hβ) = 100 are obtained using a computed [O II] branching ratio F(λλ7320,30)/F(λ2470) and an observed ratio F(λλ7320, 30)/F(Hβ). The deduced carbon abundance is log {C} = 8.85 ± 0.2 compared with log {C} = 8.67 ± 0.1 for the Sun. A critical discussion is given on methods used previously to determine carbon abundances in planetary nebulae.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 1980
- DOI:
- 10.1093/mnras/191.1.13
- Bibcode:
- 1980MNRAS.191...13H
- Keywords:
-
- Abundance;
- Carbon;
- Planetary Nebulae;
- Stellar Spectra;
- Ultraviolet Spectra;
- Atomic Excitations;
- Atomic Recombination;
- Electron Energy;
- Forbidden Bands;
- H Beta Line;
- Iue;
- Magnesium;
- Oxygen Ions;
- Astrophysics