AAS 201st Meeting, January, 2003
Session 22. Highly Structured Outflows from Post MS-Stars
Special, Monday, January 6, 2003, 10:00-11:30am, 6AB

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[22.04] Blowing Up Warped Disks

V. Icke (Sterrewacht Leiden)

Planetary nebulae are rarely spherical. More often they show a pronounced bipolar shape. Balick proposed that such forms arise due to an interaction between a very fast tenuous outflow, the `last gasp' of the star, and a disk-shaped denser atmosphere left over from an earlier slow phase of mass loss. Analytical and numerical work shows that this mechanism works very well. However, many circumstellar nebulae have a `multipolar' or `point-symmetric' shape. I demonstrate that these seemingly enigmatic forms can be easily reproduced by a two-wind model in which the confining disk is warped, as is expected to occur in irradiated disks. Large-scale explosions in other non-planar disks, such as might occur in active galaxies, are expected to show similar patterns.

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The author(s) of this abstract have provided an email address for comments about the abstract: icke@strw.LeidenUniv.nl

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