Whilst the majority of planetary nebulae are (within certain
 limits) circular, some planetary nebulae have a strong
 asymmetric structure and seem to have bibolar outflow of matter.
 These nebulae show strong knots perpendicular to the
 apparent axis of the outflow.
 It is widely assumed that these objects are members of
 double star sytems. (see Corradi and Schwarz, 1993, A&A, 268,
 714 and very recent discussions between H.E.Scharz and S.Kwok
 at the Haifa conference 8.-12.8.94).
 It seems that such systems consist of a PNCS and a second
 highly evolved star in an AGB or post-AGB state.
 Gravitational forces drag highly evolved matter from far inside
 the central object(s) along the plane of the orbit.
 This proposal aims mainly at the study of the dust which
 builds from this higly evolved material. The objects were
 chosen to be nearly edge-on systems, to be able to
 model the observations. Another criteria was an unusal
 hot IRAS [12]-[25] color index.
 We intend to use angularily resolved color maps to model
 density and energy profiles within the disks of the systems.
 One target is a newly dicovered object of our own, which shows
 exactly the same optical characteristics.