Computer Science – Sound
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..514m&link_type=abstract
Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 514-523.
Computer Science
Sound
78
B Stars, O Stars, Radiative Transfer, Sound Waves, Stellar Winds, Absorption Spectra, Numerical Analysis, Optical Thickness, Wave Dispersion
Scientific paper
The velocity perturbation associated with an outwardly propagating sound wave in a radiation-driven stellar wind gives rise to a periodic Doppler shifting of absorption lines formed in the flow. A linearized theory applicable to optically thin waves is used to show that the resulting fluctuation in the absorption-line force can cause the wave amplitude to grow. Detailed calculations of the acceleration due to a large number of lines indicate that significant amplification can occur throughout the high-velocity portion of winds in which the dominant force-producing lines have appreciable optical depths. In the particular case of the wind of Zeta Pup (O4f), it is found that the e-folding distance for wave growth is considerably shorter than the scale lengths over which the physical properties of the flow vary. A qualitative estimate of the rate at which mechanical energy due to nonlinear waves can be dissipated suggests that this mechanism may be important in heating the supersonic portion of winds of early-type stars.
Hartmann Lee
MacGregor Keith B.
Raymond John C.
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