The onset of axial symmetry in protoplanetary nebulae |
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| Authors: | C J Skinner M Meixner M J Barlow K Justtanont J F Arens J G Jernigan |
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| Institution: | (1) L-413, Lawrence Livermore National Laboratory, IGPP, USA;(2) Astronomy Dept, University of Illinois, USA;(3) Dept of Physics & Astronomy, University College London, U.K.;(4) Space Sciences Laboratory, University of California, Berkeley, USA;(5) Present address: NASA-Ames Research Center, USA |
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| Abstract: | We have obtained resolved IR images, at wavelengths from 1.2µm to 12.5µm, of a small sample of protoplanetary nebulae. The results suggest that all PPNe are axially, not spherically, symmetric, that spherical symmetry ends at the tip of the AGB, and that AGB evolution terminates with a burst of remarkably rapid, equatorially concentrated mass-loss. |
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| Keywords: | PPN mass-loss bipolar nebulae |
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