Wobbling accretion disks, jets, and point-symmetric nebulae

We present numerical calculations of the evolution of an accretion disk that is irradiated by a central source. The parameters chosen represent those of the central star of a planetary nebula. We show that an irradiation-induced warping can occur in the disk and that it is accompanied by a wobbling motion in both the inclination and azimuthal directions. Since jets are assumed to be perpendicular to the inner disk, this motion is capable of producing the ''point-symmetric'' morphology observed in some nebulae.