Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.4301m&link_type=abstract
American Astronomical Society, 196th AAS Meeting, #43.01; Bulletin of the American Astronomical Society, Vol. 32, p.743
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a simple, robust mechanism for producing an equatorially concentrated wind (excretion disk) from a non-rotating AGB or post-AGB star. This equatorial density enhancement (existing in a slow wind) presents an aspherical inertial barrier to subsequent fast, isotropic winds that may occur. Such a barrier may act as a nozzle for producing the axisymmetric (elliptical or bipolar) morphologies exhibited by many PNe without invoking merging binary systems or surface rotation near breakup. In the presented model, the star initially has a dipole magnetic field that is inflated by the wind to become mostly radial but oppositely directed above and below the equator. The interaction between the wind plasma and magnetic field produce a steady-state outflow in which magnetic forces direct plasma toward the equator. We also present the results of MHD simulations that confirm the model.
Balick Bruce
Goodson Anthony
Matt Sean
Winglee Robert
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