Hajduk, M. ; van Hoof, P. A. M. ; Zijlstra, A. A.

published in 19th European Workshop on White Dwarfs, 493, pp. 533 (2015)

Abstract: 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.

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