Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..301c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 301-311.
Astronomy and Astrophysics
Astronomy
18
Carbon, Electron Recombination, Line Spectra, Planetary Nebulae, Ultraviolet Astronomy, Ultraviolet Spectra, Data Reduction, High Resolution, Iue, Spectral Line Width, Wavelengths
Scientific paper
High-dispersion observations of IC 418 by the IUE satellite show the C II lines (1) 1334.53 A, (2) 1335.66 A, and (3) 1335.71 A. The profiles are of the P Cygni type, a form expected to result from scattering in the expanding nebular shell, with a mean velocity difference between nebular emission lines and interstellar absorption lines of 47 km/sec. The interpretation of flux ratios demonstrates that the 1335 A lines are excited by dielectronic recombination, and comparison with the C II 4267 A recombination line indicates that the flux in 1335 A is attenuated by a factor of 0.54 due to absorption by dust within the nebula. The observed ratio F(2 + 3)/F(1) of fluxes in the C II lines is 1.5 + or - 0.4, compared with the ratio of 2.0 expected for LS coupling. Further research is recommended to determine whether dielectronic recombination can lead to significant departures from the LS coupling ratio.
Clavel Jean
Flower David R.
Seaton M. J.
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