The effect of artificial viscosity on a hydrodynamic model of Cepheids |
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| Authors: | Takeuti Ishida & Tanaka |
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| Institution: | Astronomical Institute, Graduate School of Science, Tôhoku University, Aoba-ku, Sendai, 980-77 Japan,;Nishi-Harima Astronomical Observatory, Sayo-cho, Hyogo, 679-53 Japan,;Faculty of Education, Ibaraki University, Bunkyo, Mito, 310 Japan |
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| Abstract: | The effect of artificial viscosity on a hydrodynamic simulation of stellar radial pulsation is examined for the purpose of studying the dependence of the modal coupling on the sharpness of the shock front. The model used in our study is a 2.5-d first-overtone pulsator in the Cepheid instability strip. By increasing the parameters in the von Neumann–Richtmyer formula of artificial viscosity, we obtained a low growth rate together with a small pulsation amplitude. The time-scale related to pulsation mode-switching is also increased. |
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| Keywords: | hydrodynamics stars: oscillations Cepheids |
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