Ultraviolet spectra of planetary nebulae. I - The abundance of carbon in IC 418

Details Ultraviolet spectra of planetary nebulae. I - The abundance of carbon in IC 418 Ultraviolet spectra of planetary nebulae. I - The abundance of carbon in IC 418

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191...13h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 191, Apr. 1980, p. 13-22.

Astronomy and Astrophysics

Astronomy

69

Abundance, Carbon, Planetary Nebulae, Stellar Spectra, Ultraviolet Spectra, Atomic Excitations, Atomic Recombination, Electron Energy, Forbidden Bands, H Beta Line, Iue, Magnesium, Oxygen Ions

Scientific paper

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.

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