Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..725f&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Oct. 15, 1980, p. 725-727.
Astronomy and Astrophysics
Astrophysics
16
Carbon, Electron Density (Concentration), Infrared Spectra, Planetary Nebulae, Protoplanets, Forbidden Transitions, Iue, Radial Velocity, Spectral Line Width, Spectrograms
Scientific paper
Electron densities for IC 418, NGC 6572, IC 1297, NGC 3242, NGC 6818, NYC 3211, and HM Sagittae derived from high-dispersion IUE C III] spectrograms are consistently higher than those derived from either surface brightness measurements or forbidden line intensity ratios in the visible. The nebulae were selected for a range of excitation classes from 3 to 9. Line splitting due to expansion velocities is observed for three objects. The great width of the λ1909 C III] line in MM Sagittae suggests large expansion velocities.
Boggess Albert
Feibelman Walter A.
Hobbs Richard W.
McCracken Curtis W.
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