The author collected informations about the temperatures of central stars of planetary nebulae from different sources. They occupy a well defined strip in the H.R.-diagram, ranging from Mv = -1 to 9 and log Teff from 4.5 to 5.2. Superimposed are the evolutionary tracks of post-AGB models with different masses as they follow from Paczynski (1971) and Schönberner (1979, 1983). The post-AGB models with quiescent hydrogen burning give in all respects a very satisfactory description of the evolution of the central stars studied in this work.
Observational Tests of the Stellar Evolution Theory
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