Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..182p&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, March 1992, p. 182-188.
Astronomy and Astrophysics
Astronomy
20
Red Giant Stars, Stellar Envelopes, Stellar Mass Ejection, Planetary Nebulae, Protoplanets
Scientific paper
This paper examines the evolutionary process of expansion of a magnetized ring of cool matter ejected from a red giant. The subsequent formation of a circumstellar shell or preplanetary nebula is also analyzed. The velocity, density, and magnetic field are calculated along a time sequence, on a large two-dimensional grid of points close to and far away from the star. Owing to long-range forces such as thermal pressure gradients and magnetic stresses, the velocity field becomes a linear function of the distance. The latitudinal dependence of this function is poor, while the density distribution is clearly aspheric. The magnetic field intensity at a distance of about 10 exp 15-10 exp 16 cm is in good agreement with the observational data. The isophotes are plotted and compared to observational contours obtained from the literature. The filamentary structure appearance and its stability within the envelope are also discussed.
Leclercq Josette
Pascoli Gianni
Poulain B.
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