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- W2039294807 abstract "A. N. Cox recently showed that a 20% opacity decrease in the 20,000–30.000 K region as indicated by the new Livermore OPAL opacities reconciles the discrepancy between pulsation and evolution masses of double-mode RR Lyrae variables. Nonlinear hydrodynamic calculations were performed for RR Lyrae models of mass 0.75M ⊙, 51L ⊙, and Z = 0.0001 (Osterhoff II type) including this opacity decrease. The Stellingwerf periodic relaxation method was used to converge the models to a limit cycle, and the Floquet matrix eigenvalues calculated to search for a tendency of the fundamental mode to grow from the full-amplitude overtone solution, and the overtone mode to grow from the full-amplitude fundamental solution, thereby predicting double-mode behavior. Models of T eff < 7000 K with the opacity decrease have positive fundamental-mode growth rates in the overtone solution, in contrast to earlier results by Hodson and Cox (1982), and models with T eff > 7000 have positive 1st overtone growth rates in the fundamental-mode solution, but double-mode behavior was not found." @default.
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- W2039294807 date "1993-01-01" @default.
- W2039294807 modified "2023-10-18" @default.
- W2039294807 title "Nonlinear RR Lyrae Models with New Livermore Opacities" @default.
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- W2039294807 doi "https://doi.org/10.1007/978-94-011-1062-4_46" @default.
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