Abstract
view Abstract Citations (47) References (47) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS IUE observations of proto-planetary nebulae. I. V1016 Cyg, HM SGE andHBV 475. Feibelman, W. A. Abstract The IUE satellite has undertaken UV observations of the proto-planetary nebulae V1016 Cyg, HM Sge, and HBV 475, yielding emission line fluxes, line ratios, line profiles, electron densities, and distances from these objects. While levels of increasing excitation and ionization as a function of time are shown by the data for the first two nebulae, the trend for HBV 475 is found to lead in the opposite direction. The formation of a shell is suggested by dramatic changes in the HM Sge UV line profiles over the last four years, including the disappearance of W-R features and the incipient splitting of the semi-forbidden C III 1909 A line. An additional IUE search for UV variability in the planetary nebulae IC 4997 and NGC 6905 has yielded emission line fluxes, line ratios and profiles, and central star temperatures, as well as stratification effects data for several ions in NGC 6905 Publication: The Astrophysical Journal Pub Date: July 1982 DOI: 10.1086/160105 Bibcode: 1982ApJ...258..548F Keywords: Emission Spectra; Iue; Line Spectra; Planetary Nebulae; Protoplanets; Ultraviolet Spectra; Electron Density (Concentration); Ionization; Molecular Excitation; Stellar Temperature; Astronomy full text sources ADS | data products SIMBAD (6) MAST (1) INES (1) Related Materials (1) Part 2: 1982ApJ...258..562F
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