A Paradigm Lost: New Theories for Aspherical PNe

Details A Paradigm Lost: New Theories for Aspherical PNe A Paradigm Lost: New Theories for Aspherical PNe

1999-12-09

arxiv.org/abs/astro-ph/9912191v1

Astronomy and Astrophysics

Astrophysics

10 pages, To appear in Asymmetrical Planetary Nebulae II, ASP Conference Series, J.H. Kastner, N. Soker, & S. Rappaport, eds

Scientific paper

Theoretical Models for the shaping of PNe are reviewed in light of new high resolution images. The new data indicate the purely hydrodynamic interacting stellar winds model can not recover the full variety of shapes and kinematics. New models, some speculative, others more firmly grounded are discussed. In particular, accretion disks and magnetic fields are identified as two of the most promising avenues of future research. Outstanding issues such as jet formation by PNe disks and dynamo activity in P-AGB stars remain to studied. Finally, new simulations of the Egg Nebula are presented as an example of a ``paleontological'' study designed to recover the history of an individual object.

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