Abstract
We have analyzed the plasma diagnostics (electron densities and temperatures and abundance ratios), and the kinematics of a large sample of planetary nebulae around [WC] stars by means of high resolution spectra. The results have been compared with characteristics of planetary nebulae around WELS and non-WR central stars. We find that the proportion of nitrogen rich nebulae is larger in WRPNe than in non-WRPNe. None of the 9 nebulae around WELS in our sample shows N-enrichment. WRPNe have larger expansion velocities and/or larger turbulence than non-WRPNe demonstrating that the mechanical energy of the massive [WC] stellar wind largely affects the kinematical behavior of nebulae. A weak relation between stellar temperature and expansion velocities has been found for all kind of nebulae, indicating that older nebulae expand faster. The effect is more important for WRPNe. This could be useful in testing the evolutionary sequence [WC]-late -> [WC]-early, proposed for [WC] stars.
