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Electron densities for six planetary nebulae and HM SGE derived from the C 3 lambda 1907/1909 ratioElectron densities for IC 418, NGC 6572, IC 1297, NGC 3242, NGC 6818, NGC 3211, and HM Sge derived from high dispersion IUE C III spectrograms are consistently higher than those derived from either surface brightness measurements of 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 lambda 1909 C III line in HM Sge suggests large expansion velocities.
Document ID
19810017425
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Date Acquired
August 11, 2013
Publication Date
January 1, 1981
Publication Information
Publication: The Universe at Ultraviolet Wavelengths: The First Two Yrs. of Intern. Ultraviolet Explorer
Subject Category
Astrophysics
Accession Number
81N25961
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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