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Abstract: The study of PN has been confronting a growing list of dilemmas which haveyet to find coherent resolution. These issues are both observational andtheoretical and can be stated as a series of -facts- which can not, as of yet,be accounted for via a single framework. We review these facts and propose askeleton framework for developing a new understanding post-AGB stars, PPN andPN. Our framework represents an attempt to articulate a a global perspective onthe late stages of stellar evolution that can embrace both the nature of thecentral engine and the outflows they produce. Our framework focuses oninteracting binary central stars which drive collimated outflows through MHDprocesses. We propose that the field of AGB-PN studies now faces a -GrandChallenge- in articulating the observational systematics of these objects in away that can address issues related to binarity and magnetic shaping. Atheoretical Grand Challenge is also faced in the form of integrated studieswhich can explicate the highly non-linear processes associated with MHDoutflows driven by interacting binaries. These issues include the generation ofmagnetic fields via dynamo processes, the creation of accretion disks, thedynamics of Common Envelope ejection and the creation of magnetized jets.



Author: Adam Frank, Orsola De Marco, Eric Blackman, Bruce Balick

Source: https://arxiv.org/







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