Physics – Optics
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974phdt.........1k&link_type=abstract
Ph.D. Thesis - Maryland Univ., College Park National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbel
Physics
Optics
Atmospheric Models, Atmospheric Optics, Cepheid Variables, Hydrodynamic Equations, Stellar Atmospheres, Cepheus Constellation, Energy Spectra, Line Spectra, Turbulence Effects
Scientific paper
A method for including the solution of the transfer equation in a standard Henyey type hydrodynamic code was developed. This modified Henyey method was used in an implicit hydrodynamic code to compute deep envelope models of a classical Cepheid with a period of 12(d) including radiative transfer effects in the optically thin zones. It was found that the velocity gradients in the atmosphere are not responsible for the large microturbulent velocities observed in Cepheids but may be responsible for the occurrence of supersonic microturbulence. It was found that the splitting of the cores of the strong lines is due to shock induced temperature inversions in the line forming region. The adopted light, color, and velocity curves were used to study three methods frequently used to determine the mean radii of Cepheids. It is concluded that an accuracy of 10% is possible only if high quality observations are used.
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