Turbulent outflows from [WC]-type nuclei of planetary nebulae 1. BD+30 degrees 3639 and other [WC 9-10] stars

Using spectroscopic observations taken at the Observatoire de Haute-Provenc e (OHP, France) and the European Southern Observatory (ESO, Chile), we desc ribe wind fluctuations in four [WC 9-10]-type central stars of planetary ne bulae, especially ED +30 degrees 3639, which was observed intensively durin g 15 nights. Moving features seen on the top of the C III lambda 5696 emiss ion line are interpreted as outflowing "blobs" which are radially accelerat ed outwards, as seen in the winds of massive Wolf-Rayet stars. We find line profile variations occurring on a time scale of hours. Kinematic parameter s of the blobs are derived and compared to those of massive Wolf-Rayet star s. The wind fragmentation process appears independent of the strong differe nces between both types of hot stars.