Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61...39r&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 1, Oct. 1977, p. 39-45.
Astronomy and Astrophysics
Astrophysics
69
Acoustic Propagation, Chromosphere, Late Stars, Stellar Atmospheres, Astrophysics, Radiant Flux Density, Stellar Gravitation
Scientific paper
Acoustic-energy generation in stars is investigated, and results are presented for computations concerning acoustic-wave propagation in stellar atmospheres. Acoustic fluxes and wave periods are calculated for the chemical composition X 0.7, Y 0.28, Z 0.2, as well as for log g of -1 to 6, effective temperatures of 2800 to 10,000 K, and mixing length/pressure scale height ratios of 0.5, 1, and 1.5. The Cox and Stewart (1970) opacities are used together with a cubic interpolation procedure, the standard mixing-length theory of convection, and the Lighthill (1952) theory of sound generation. The variation of convective velocity as a function of input parameters is examined, and acoustic fluxes are obtained for several stellar envelope models. The period at which a monochromatic acoustic flux has its maximum is evaluated as a function of surface gravity. Uncertainties in the analysis are briefly discussed.
Cacciari Carla
Renzini Alvio
Schmitz Felix
Ulmschneider Peter
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