Statistics – Computation
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..350p&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 675, May 1992, p. 350-361. Research supported
Statistics
Computation
34
Planetary Nebulae, Red Giant Stars, Stellar Envelopes, Stellar Evolution, Stellar Winds, Computational Astrophysics, Gas Flow, Magnetization, Magnetohydrodynamics
Scientific paper
A comprehensive model in which the process of gas outflow by an evolved star (post-AGB stars) and the subsequent circumstellar shell formation are examined is proposed. The buoyant transport of an isolated toroidlike tube through the red-giant convective envelope originating from the innermost regions of the star and composed of strongly magnetized gas is investigated. When carrying up to a position immediately above the stellar surface, such a tube is no longer confined by the gas pressure existing throughout the red-giant envelope and consequently expands. It is hypothesized that the confluence of such magnetized tubes can produce a disklike structure of cool matter which surrounds the star.
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