Computer Science – Sound
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985nascp2358..233w&link_type=abstract
In NASA. Goddard Space Flight Center The Origin of Nonradiative Heating/Momentum in Hot Stars p 233-235 (SEE N85-17755 08-88)
Computer Science
Sound
Hot Stars, Radiation Distribution, Sound Waves, Stellar Motions, Stellar Radiation, Wave Amplification, X Ray Spectra, Astronomical Models, Celestial Bodies, Doppler Effect, Gray Gas, Hydrodynamics, Partial Differential Equations, Radiation Transport, Waveforms
Scientific paper
The discovery of broad P Cygni profiles in early type stars and the detection of X-rays emitted from the envelopes of these stars made it clear, that a considerable amount of mechanical energy has to be present in massive stars. An attack on the problem, which has proven successful when applied to late type stars is proposed. It is possible that acoustic waves form out of random fluctuations, amplify by absorbing momentum from stellar radiation field, steepen into shock waves and dissipate. A stellar atmosphere was constructed, and sinusoidal small amplitude perturbations of specified Mach number and period at the inner boundary was introduced. The partial differential equations of hydrodynamics and the equations of radiation transfer for grey matter were solved numerically. The equation of motion was augmented by a term which describes the absorption of momentum from the radiation field in the continuum and in lines, including the Doppler effect and allows for the treatment of a large number of lines in the radiative acceleration term.
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