Abstract

The main aim of this work was to confirm that expansion of planetary nebulae surrounding Wolf-Rayet type central stars is characterized by turbulent motions or strong variations of velocity in the radial direction relative to the nucleus. Such properties have already been found in M1-25, M3-15 and Pe1-1 by Gȩsicki & Acker (1995). We have analyzed the photoionization structure and velocity field of the NGC 40 - a planetary nebula with late type ([WC 8]) Wolf-Rayet nucleus. The spectra of Ha and [NII] lines have been obtained with the 1.5m telescope at the Observatoire de Haute-Provence. The spectro-graph Aurelie with dispersion of 5A/mm and a 3” circular entrance was used. The method and the details of the applied computer codes are published in Gȩsicki et al. (1996).

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