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The dynamics of double-envelope planetary nebulae
A number of criteria are elaborated based on the the careful analysis ofnebulae images which confirm the version of the orgin of double-envelopeplanetary nebulae by means of dynamical separation but not by multipleejection. The importance of stellar winds in the origin of the gigantichalos around double envelope nebulae is outlined. The problem concerningthe existence of two types of filamentary planetary nebulae is raised:type A, filaments are the fragmentations of the 'Rayleigh-Taylorinstability', the result of dynamical interaction of the envelope withthe outer interstellar matter (NGC 6543), and type B, the orgin offilaments is connected with the 'Magnetic field fluctuations' (A 43, A72). The possibility of the origin of three-envelope nebulae in theframework of the dynamic seperation version is discussed (NGC 7293).Attention is paid to the impossibility of outbursts with low velocities(20 to 30 km/sec) from hot stars, i.e., the nuclei of nebulae.
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