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Radiative Amplification of Acoustic Waves in Hot StarsThe 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.
Document ID
19850009477
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wolf, B. E.
(Heidelberg Univ. Heidelberg, Germany)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: NASA. Goddard Space Flight Center The Origin of Nonradiative Heating(Momentum in Hot Stars
Subject Category
Astrophysics
Accession Number
85N17786
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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