Outflow Collimation in Bipolar Symbiotic Nebulae

Details Outflow Collimation in Bipolar Symbiotic Nebulae Outflow Collimation in Bipolar Symbiotic Nebulae

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9050b&link_type=abstract

HST Proposal ID #9050

Physics

Hst Proposal Id #9050 Ism And Circumstellar Matter

Scientific paper

Flow collimation in evolved stars is neither expected nor understood. Classical theories of stellar evolution do not predict and cannot explain this bipolarity. More exotic concepts {binary interactions, spun-up atmospheres, poloidal or toroidal magnetized winds} have been proposed, but observations are yet to verify or falsify any of their predictions. We propose to probe the near-nuclear morphology and kinematics of four bright, low-extinction targets whose large-scale structure is highly bipolar. Our goal is to provide a detailed description of the circumnuclear outflows, to uncover the physical structure and nature of the collimator, and to evaluate the speculative collimation mechanisms. The bright nucleus has hampered efforts to explore the nebular collimators that lie close to the star, so we'll use STIS to disperse the nuclear light and, thus, to avoid its glare. A secondary goal is to obtain second-epoch WFPC2 images of all targets. The outflow speeds predict readily measurable proper motions of > 2 PC pix in 3 yr at distances of 0.5-1 kpc.

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