2000A&A...364..597G

Using spectroscopic observations taken at the Observatoire de Haute-Provence (OHP, France) and the European Southern Observatory (ESO, Chile), we describe wind fluctuations in four [WC 9-10]-type central stars of planetary nebulae, especially BD +30 3639, which was observed intensively during 15 nights. Moving features seen on the top of the CIIIλ5696 emission line are interpreted as outflowing ``blobs'' which are radially accelerated outwards, as seen in the winds of massive Wolf-Rayet stars. We find line profile variations occurring on a time scale of hours. Kinematic parameters of the blobs are derived and compared to those of massive Wolf-Rayet stars. The wind fragmentation process appears independent of the strong differences between both types of hot stars.