Statistics – Computation
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397..644m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 2, p. 644-651.
Statistics
Computation
37
Cosmic Dust, Interstellar Gas, Late Stars, Stellar Atmospheres, Stellar Winds, Supergiant Stars, Computational Astrophysics, Stellar Envelopes, Stellar Evolution, Stellar Models, Velocity Distribution
Scientific paper
An assumption inherent to most models of dust-driven winds from cool, evolved stars is that the radiative and collisional drag forces acting on an individual dust grain are in balance throughout the flow. We have checked the validity of this supposition of 'complete momentum coupling' by comparing the grain motion obtained from such a model with that derived from solution of the full grain equation of motion. For physical conditions typical of the circumstellar envelopes of oxygen-rich red giants, we find that silicate grains with initial radii smaller than about 5 x 10 exp -6 cm decouple from the ambient gas near the base of the outflow. The implications of these results for models of dust-driven mass loss from late-type giants and supergiants are discussed.
MacGregor Keith B.
Stencel Robert E.
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