Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..864h&link_type=abstract
Astrophysical Journal, Part 1, vol. 215, Aug. 1, 1977, p. 864-872.
Astronomy and Astrophysics
Astrophysics
28
O Stars, Planetary Nebulae, Stellar Atmospheres, Stellar Models, Stellar Spectra, Stellar Temperature, Chemical Composition, Early Stars, Line Spectra, Photon Density, Spectrum Analysis, Stellar Evolution, Thermodynamic Equilibrium
Scientific paper
The atmospheric properties of seven planetary nuclei which have O or Of-type spectra were determined by use of the Zanstra method and by analysis of the visual line spectra. One finding is that the O-type spectral sequence may extend to effective temperatures of 90,000 kelvins or more, if the results of the Zanstra method are to be believed. However, there are some indications of internal inconsistency in the Zanstra method and some outstanding discrepancies between the effective temperatures indicated by the Zanstra method and those indicated from analysis of the visual line spectra. Two ways to resolve these discrepancies are to postulate an excess of extreme-UV stellar flux or to postulate a hot binary companion for some central stars. In either case the validity of the Harmon-Seaton evolutionary sequence for central stars becomes questionable.
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