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Spatial Distributions of Multiple Dust Components in the PPN/PN Dust Shells
Toshiya Ueta, Angela K. Speck, Margaret Meixner +5
We investigate spatial distributions of specific dust components in the circumstellar shells of a proto-planetary nebula candidate, HD 179821, and a planetary nebula, BD$+30^{\circ…
Morphological Properties of PPNs: Mid-IR and HST Imaging Surveys
Toshiya Ueta, Margaret Meixner
We will review our mid-infrared and HST imaging surveys of the circumstellar dust shells of proto-planetary nebulae. While optical imaging indirectly probes the dust distribution v…
Discovery of an Extended Dust Emission around IRAS 18576+0341 (AFGL 2298) at 10.3 and 18.0 microns: a New Luminous Blue Variable Candidate?
Toshiya Ueta, Margaret Meixner, Aditya Dayal +4
We report detection of an extended mid-infrared emission from \iras 18576+0341 (AFGL 2298). The object shows a dusty circumstellar shell that has diameter of $\age 7\arcsec$ at 10.…
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…