Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-04
Astronomy and Astrophysics
Astrophysics
To appear in ``Asymmetrical Planetary Nebulae II: from Origins to Microstructures,'' ASP Conference Series, Vol. 199, 2000; J.
Scientific paper
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-Obvious Low-level-Elongated (SOLE) nebulae show a bright central star embedded in a smooth, faint extended nebulosity, whereas the DUst-Prominent Longitudinally-EXtended (DUPLEX) nebulae have remarkable bipolar structure with a completely or partially obscured central star. The intrinsic axisymmetry of the PPN reflection nebulosities demonstrates that the axisymmetry often found in planetary nebulae predates the PPN phase. We suggest that the major cause for the apparent dual morphology is the optical depth difference in the circumstellar dust shell rather than the inclination angle effect.
Bobrowsky Matthew
Meixner Margaret
Ueta Toshiya
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