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

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dc.creatorUeta, Toshiya
dc.creatorMeixner, Margaret
dc.creatorBobrowsky, Matthew
dc.date1999-10-04
dc.date2000-01-28
dc.date.accessioned2026-07-07T02:33:40Z
dc.date.available2026-07-07T02:33:40Z
dc.descriptionWe 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.
dc.descriptionTo appear in ``Asymmetrical Planetary Nebulae II: from Origins to Microstructures,'' ASP Conference Series, Vol. 199, 2000; J.H. Kastner, N. Soker, & S.A. Rappaport, eds
dc.identifierhttps://arxiv.org/abs/astro-ph/9910063
dc.identifierhttp://arxiv.org/abs/astro-ph/9910063
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14935
dc.subjectAstrophysics
dc.titleDual Axisymmetry in Proto-Planetary Nebula Reflection Nebulosities: Results from an HST Snapshot Survey of PPN Candidates
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