Statistics – Computation
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...179..371w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 179, no. 1-2, June 1987, p. 371-382. DFG-supported research.
Statistics
Computation
1
Acoustic Propagation, Early Stars, Stellar Evolution, Stellar Models, Stellar Radiation, Computational Grids, Hydrodynamic Equations, Optical Thickness, Spectral Line Width, Stellar Atmospheres
Scientific paper
The author describes a method for the numerical treatment of the line acceleration necessary for a correct hydrodynamical, time-dependent, description of the behavior of the outer layers of early-type stars. He abandons some of the approximations employed in the literature, which are inapplicable for the calculation of sound waves and derives, after a series of approximations, a formula for the numerical computation of the line radiation acceleration, which allows a swift, though approximate, evaluation of the influence of many lines. Hence the effect of the acceleration of gas due to an ensemble of spectral lines can now be included into time-dependent, non-stationary, non-linear hydrodynamic computations, which can be numerically solved with a reasonable amount of computer time. The numerical code briefly is discussed and preliminary results of the calculations are reported.
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