Ultraviolet spectra of planetary nebulae. IV - The C III lambda 2297 dielectronic recombination line and dust absorption in the C IV lambda 1549 resonance doublet

Details Ultraviolet spectra of planetary nebulae. IV - The C III lambda 2297 dielectronic recombination line and dust absorption in the C IV lambda 1549 resonance doublet Ultraviolet spectra of planetary nebulae. IV - The C III lambda 2297 dielectronic recombination line and dust absorption in the C IV lambda 1549 resonance doublet

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195p..21h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 195, May 1981, p. 21P-26P.

Astronomy and Astrophysics

Astronomy

32

Absorption Spectra, Carbon, Ion Recombination, Planetary Nebulae, Resonance Lines, Ultraviolet Spectra, Abundance, Astronomical Spectroscopy, Cosmic Dust, Iue, Line Spectra, Spectrum Analysis, Ultraviolet Astronomy

Scientific paper

Calculations by Storey confirm, as suggested in Paper I of the present series, that dielectronic recombination via low-lying auto-ionizing states is important for the calculation of the ionization equilibria of carbon ions. These processes also produce various spectrum lines, of which one is C III 2p2 1D → 2s 2p 1P λ2297. Observations of this line are reported for NGC 7009 and 7662. Using C3+ abundances deduced from λ 2297, it is shown that the fluxes in the C IV λ 1549 resonance doublet are attenuated by dust absorption. The C/H abundance ratios deduced from C III λ2297, C III] λ1908 and C II] λ2326 are 4 × 10-4 for NGC 7009 and NGC 7662.

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