Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..486i&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 2, p. 486-490
Astronomy and Astrophysics
Astrophysics
4
Cosmic Dust, Dynamic Models, Flow Velocity, Gas Dynamics, Giant Stars, Interstellar Matter, Late Stars, Stellar Envelopes, Stellar Models, Equations Of Motion, Grain Size, Mathematical Models, Radiation Pressure, Spheroids, Transport Properties
Scientific paper
The drift of spheroidal and spherical grains in the envelopes of M giants is considered. It is found that for small metallic grains, the velocity relative to the gas should strongly depend on the grain shape. For example, the velocity of a dirty iron spheroid with a semiaxes ratio of 2-4 is about 1.5-3 times larger than the velocity of an equal volume sphere, the difference of the velocities being as large as a 1 km/s. Probably, a dependence of the velocity on grain shape also occurs for normal size silicate grains. Thus, in modeling the dynamics of the envelopes, one should bear in mind the possibility of a much more efficient interaction of radiation with dust than usually proposed due to a deviation of grains' shape from a spherical one. The same effect could occur in the envelopes of carbon-rich giants and protostars.
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