Other
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981msngr..26....7k&link_type=abstract
The Messenger, vol. 26, p. 7-9
Other
2
Central Stars:Planetary Nebulae, Central Stars:Spectra
Scientific paper
Twenty-five per cent of all central stars 01 planetary nebulae which have been studied spectroscopically are classified as "continuous", which means that they do not show any sign of stellar absorption or emission lines, at least in the visible part of the spectrum. The existence of this kind of spectrum poses an interesting problem: The effective temperatures of the "continuous" objects can be estimated from the emission line spectrum of the surrounding nebula my means of the wellknown "Zanstra method". As it turns out, the temperatures are mainly between 50,000 K and 100,000 K. On the other hand, non-LTE model atmosphere calculations lor very hot stars (as carried out in Kiel) show that even at 100,000 Kthere should be easily detectable H or He lines for any reasonable surface gravity, unless the atmosphere is essentially free of these elements. But even if we admit the absence of hydrogen and helium, we can estimate that strong lines 01 carbon (or nitrogen or oxygen) should be observable in this case.
Kudritzki Rolf Peter
Mendez Roberto H.
Simon K. P.
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