通过气体介质的双星：动力拖曳力和内转矩
Binaries traveling through a gaseous medium: Dynamical drag forces and internal torques
摘要：
利用含时线性理论，研究了在均匀气体背景下，质心以速度Vcm运动的双星引力尾流的形态。为了简单起见，我们假设双星的组成部分都是围绕它们共同的质心的圆形轨道。动力学摩擦的后果是双重的。首先，气体动力学摩擦可能拖曳双星的质心，导致双星迁移。第二，阻力也会引起制动力矩，这会导致双星的轨道收缩。我们计算的阻力作用在一个组成部分的二元由于重力相互作用与自己的尾流。我们发现，由于引力聚焦的损失，导致双星系统质心减速的动力学摩擦力比质点系统中的小。我们表明，制动内扭矩取决于每个二元组件的质心的马赫数，也对质心的二元的马赫数。一般来说，内扭矩随着双星相对于周围气体云的速度的增加而减小。然而，情况并非总是如此。我们还提到我们的结果的相关性的二进制的周期分布。
英文摘要：
Using time-dependent linear theory, we investigate the morphology of the gravitational wake induced by a binary, whose center of mass moves at velocity Vcm against a uniform background of gas. For simplicity, we assume that the binary's components are on circular orbits about their common center of mass. The consequences of dynamical friction is twofold. First, gas dynamical friction may drag the binary's center of mass and cause the binary to migrate. Second, drag forces also induce a braking torque, which causes the orbits of the binary components to shrink. We compute the drag forces acting on one component of the binary due to the gravitational interaction with its own wake. We show that the dynamical friction force responsible to decelerate the binary's center of mass is smaller than it is in the point-mass case because of the loss of gravitational focusing. We show that the braking internal torque depends on the Mach numbers of each binary component about their center of mass, and also on the Mach number of the center of mass of the binary. In general, the internal torque decreases with increasing the velocity of the binary relative to the ambient gas cloud. However, this is not always the case. We also mention the relevance of our results on the period distribution of binaries.
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