4 papers · 1 filter
HST/NICMOS Imaging Polarimetry of PPNs
Toshiya Ueta, Koji Murakawa, Margaret Meixner
We present the preliminary results from our HST/NICMOS imaging polarimetry on optically thin PPNs. The data show the dust distribution in an unprecedented detail. The structure of…
Properties of Proto--Planetary Nebulae
M. Meixner
This review describes some general properites of proto-planetary nebulae with particular emphasis on the recent work of morpholgical studies. The weight of observational evidence s…
The Circumstellar Matter Around OH44.8-2.3
M. Bobrowsky, B. W. Greeley, T. Ueta +1
I-band images of the OH maser source OH44.8-2.3 are presented. Having a well-determined distance, this object is shown to be very young and physically small, with an asymmetric com…
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-…