2716 20160701171709.0 ASTROimport-873 Hajduk, M. 2015 Evolution of the Central Stars of Young Planetary Nebulae The evolution of central stars of planetary nebulae was hitherto documented in just a few cases. We look for evolutionary changes of the [O iii] 5007 Å line flux in the spectra of planetary nebulae. We compared nebular fluxes collected over a time interval of a decade or more. We used literature data and newly obtained spectra. A grid of Cloudy models was computed using existing evolutionary models and compared with the observations. The observed evolution of the [O iii] 5007 Å/rmHß line flux ratio is consistent with the evolutionary model calculations for H-rich central stars. Low-excitation planetary nebulae with [WR]-type and wels central stars show slower evolution than their coutnerparts containing H-rich central stars. van Hoof, P. A. M. Zijlstra, A. A. 19th European Workshop on White Dwarfs 493 2015 533 http://esoads.eso.org/abs/2015ASPC..493..533H published in NONREF