Other
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jqsrt..15..745k&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 15, Sept. 1975, p. 745-748.
Other
Atmospheric Models, Cepheid Variables, Hydrodynamics, Optical Thickness, Radiative Transfer, Stellar Atmospheres, Astronomical Models, Dynamic Models, Energy Transfer, Hydrodynamic Equations, Light Curve, Newton-Raphson Method, Thermal Diffusion
Scientific paper
The implicit hydrodynamic code of Kutter and Sparks (1972), which is limited to optically thick regions and employs the diffusion approximation for radiative transfer, is modified to include radiative transfer effects in the optically thin regions of a model star. A modified Henyey method is used to include the solution of the radiative transfer equation in this implicit code, and the convergence properties of this method are proven. A comparison is made between two hydrodynamic models of a classical Cepheid with a 12-day period, one of which was computed with the diffusion approximation and the other with the modified Henyey method. It is found that the two models produce nearly identical light and velocity curves, but differ in the fact that the former never has temperature inversions in the atmosphere while the latter does when sufficiently strong shocks are present.
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