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Paper: Near-Infrared Continuum, H2 Line and Polarimetric Imaging of Three Proto-Planetary Nebulae with HST
Volume: 199, Asymmetrical Planetary Nebulae II: From Origins to Microstructures
Page: 167
Authors: Sahai, Raghvendra; Su, Kate Y. L.; Kwok, Sun; Dayal, Aditya; Hrivnak, Bruce J.
Abstract: As part of a comprehensive study of the origins of aspherical structure in planetary nebulae, we report here high-resolution near-infrared images of 3 bipolar protoplanetary nebulae (PPN), Roberts 22, Hen 401, and the Boomerang Nebula, obtained with NICMOS/HST. The Hubble images reveal a rich and complex morphological structure of the circumstellar material for each of these objects. Although all 3 PPNe are bipolar, their morphologies differ substantially in detail, with important implications for current theories for the formation and shaping of aspherical PN.
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