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Paper: Near-Infrared Imaging Polarimetry of Bipolar Proto-planetary Nebulae
Volume: 449, Astronomical Polarimetry 2008: Science from Small to Large Telescopes
Page: 327
Authors: Murakawa, K.; Driebe, T.; Hofmann, K.; Meixner, M.; Ohnaka, K.; Oya, S.; Schertl, D.; Weigelt, G.; Ueta, T.
Abstract: We present results of radiative transfer modeling of two bipolar proto-planetary nebulae based on the data archives of HST/NICMOS imaging polarimetry. We constrained the model parameters by fitting the spectral energy distributions, the intensity and polarization images, and assumed multiple grain models in different geometry space. From our sample, we found that (1) model geometries with a disk reproduce the bipolar appearance with a narrow waist, (2) grains in the bipolar lobes have submicron sizes, but ∼10μm or larger sizes are expected in the equatorial region, and (3) the grain sizes in the disk correlate to the disk geometry, but not the stellar temperature, luminosity, or lobe shape. Our results agree with the disk/reservoir hypothesis in PN shaping.
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