Abstract
Preliminary results from high resolution spectroscopy for a selected sample of planetary nebulae with WR nucleus or weak-emission line star (wels) are presented. The observed objects spread over a wide range in stellar characteristics: early and late [WC]-type stars and wels have been selected. Nebular densities and temperatures, as well as ionic and total abundances and expansion velocities, have been derived. The results are used to perform a statistical study of the objects in order to find possible relationships among the different stellar and nebular parameters and to analyze the effect of the WR wind on the nebular shell.
