Dual Axisymmetry in Proto-Planetary Nebula Reflection Nebulosities: Results from an HST Snapshot Survey of PPN Candidates

Toshiya Ueta, Margaret Meixner, Matthew Bobrowsky

We summarize results of our {\it HST} imaging survey of proto-planetary nebula (PPN) candidates, in which we discovered two types of axisymmetric reflection nebulosities. The Star-…