Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...126..269b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 126, no. 2, Oct. 1983, p. 269-277.
Astronomy and Astrophysics
Astrophysics
32
Astronomical Models, Cosmic Dust, Late Stars, Red Giant Stars, Stellar Winds, Two Fluid Models, Equations Of Motion, Gas Flow, Radiation Pressure
Scientific paper
A model of dust-driven wind relevant to red giant stars is investigated, in which the usual hypothesis of 'momentum coupling' (amounting to neglect of grain particle mass) is relaxed. When the momentum coupling approximation is abandoned, the sonic point is shifted outwards, and the gas and grain expansion velocities are reduced. In the supersonic part of the wind the diminution is of the order of 30 percent, but it may reach several orders of magnitude below the sonic point. An asymptotic analysis of the flow at the base of the wind shows the existence of a boundary layer where the grains suffer a very strong acceleration, the gas velocity staying almost constant. The coupling between the grains and the gas is maximum just outside the boundary layer, and decreases gradually outwards. Beyond a thousand inner envelope radii the grains and the gas are fully uncoupled. The coupling is still very strong when the velocities have saturated the almost constant values.
Berruyer Nicole
Frisch Henry
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