Ultraviolet spectra of planetary nebulae. VII - The abundance of carbon in the very low excitation nebula He 2-131

Details Ultraviolet spectra of planetary nebulae. VII - The abundance of carbon in the very low excitation nebula He 2-131 Ultraviolet spectra of planetary nebulae. VII - The abundance of carbon in the very low excitation nebula He 2-131

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200p...7a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 200, July 1982, p. 7P-12P.

Astronomy and Astrophysics

Astronomy

18

Abundance, Astronomical Spectroscopy, Carbon, Planetary Nebulae, Ultraviolet Astronomy, Fine Structure, Forbidden Transitions, Iue, Oxygen Spectra, Ratios

Scientific paper

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.

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