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Paper: AGB Star Polar Breakout and the Origin of Aspherical Planetary Nebulae
Volume: 199, Asymmetrical Planetary Nebulae II: From Origins to Microstructures
Page: 99
Authors: Stencel, Robert E.
Abstract: The problem of the transition between presumed spherical configuration of AGB stars, and manifestly aspherical shapes of proto- planetary nebula, is addressed with an hypothesis that features selective removal of high latitude stellar layers near the end of AGB phase of evolution, during thermal pulses. As deeper, hotter layers of the atmosphere and envelope are exposed, an instability related to increasing radiative forces at the poles could be triggered, promoting a bipolar flow.
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