Axisymmetrical Models for the Origin and Shaping of Proto-Planetary Nebulae

Details Axisymmetrical Models for the Origin and Shaping of Proto-Planetary Nebulae Axisymmetrical Models for the Origin and Shaping of Proto-Planetary Nebulae

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.234..281p&link_type=abstract

Astrophysics and Space Science, Volume 234, Issue 2, pp.281-301

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

Axisymmetrical models for protoplanetary nebulae are produced. We discuss the mechanism for mass loss from evolved cool stars and the characteristics of the gas outflow. By using two-dimensional magnetohydrodynamics, we find that the gas is preferentially ejected in a so-called equatorial plane. For a grid of models, the expansion velocities are found to be of the order ofv escape/2 and the mass loss rates tilde 10-5-10-4 M &sun;/year which appear consistent with the available observational data. Magnetic fields intensities in the 10-4 to 10-3 gauss range are obtained in circumstellar envelopes, in good agreement with observations (Nedoluha and Bowers, 1992).

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