Computer Science – Sound
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..183k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 183-194.
Computer Science
Sound
7
Asymptotic Giant Branch Stars, Sound Waves, Stellar Atmospheres, Stellar Mass Ejection, Stellar Physics, Stellar Winds, Hydrodynamics, Momentum Transfer, Shock Waves, Stellar Oscillations
Scientific paper
Expressions are developed for the wave-pressure tensor and its gradient for progressive and acoustic waves of arbitrary amplitude and shape. These expressions may be used in time-independent hydrodynamic calculations to model the averaged effect of acoustic waves running through a medium. It is shown that the linear theory is valid up to rather high wave amplitudes of Mach 0.6 in velocity. Linear acoustic waves of this amplitude may drive a significant mass loss only in stars with a very low surface gravity, with photospheric density scale heights of 0.04 stellar radius or more, as in extreme AGB stars. The effect of a train of small-amplitude sawtooth waves on the mean flow is studied. The force is shown to be at most of second order in shock amplitude, as it is for sinusoidal waves.
Koninx Jean-Paul M.
Pijpers Frank P.
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