D115 近接連星系における伴星表面の流れの数値計算 [in Japanese] Numerical Simulation of the Surface Flow of a Companion Star in a Close Binary System [in Japanese]
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The surface flow of a companion star in a close binary system is numerically simulated in order to understand its surface property. The binary system we consider here is rotating counter-clockwise seen from the North Pole, and has the mass ratio of unity. Calculations are performed for a region including only the gas-supplying star. The equation of state is that of an ideal gas characterized by a specific heatγ, and the case withγ=5/3 is mainly studied. Our numerical results show a formation of three eddies : the H-eddy around the pole, the L1-eddy around the L1 point, and the L2-eddy. The H-eddy is formed by the gas elements starting near the pole region and rotating clockwise around the North Pole. Because of viscosity, the H-eddy drifts to the equatorial region, and switches to the counter-clockwise eddy : the L1-eddy near the L1 point. The L1-eddy flows through the L1 point and finally forms the L1 stream. Both the H-eddy and the L1-eddy are explained in terms of the astrostrophic wind. The L2-eddy is formed at the opposite side of the L1-point, and its formation is understood by the dynamics of an eddy system.
日本流体力学会年会講演論文集 2002, 128-129, 2002