自转对坍缩恒星对流涡旋演化的影响
Impact of rotation on the evolution of convective vortices in collapsing stars
摘要：
我们研究了恒星坍缩过程中自转对对流涡旋流体动力学演化的影响。使用线性流体动力学方程，我们研究的旋涡从它们的初始半径在对流壳的较小的半径，他们预计将遇到的超新星激波的演变。我们发现，涡的演变主要是由两个效果：加速的下降和随之而来的旋转速度。前一种效应导致涡的径向拉伸，从而限制了涡的速度。后一种效应导致涡旋在旋转方向上的角变形，放大了它们的非径向速度。我们表明，旋转的旋涡的径向速度没有显着的影响。我们研究了声波发射，发现它对旋转不敏感。最后，我们分析了共转点的影响，发现它对整体声波发射的影响很小。
英文摘要：
We study the impact of rotation on the hydrodynamic evolution of convective vortices during stellar collapse. Using linear hydrodynamics equations, we study the evolution of the vortices from their initial radii in convective shells down to smaller radii where they are expected to encounter the supernova shock. We find that the evolution of vortices is mainly governed by two effects: the acceleration of infall and the accompanying speed up of rotation. The former effect leads to the radial stretching of vortices, which limits the vortex velocities. The latter effect leads to the angular deformation of vortices in the direction of rotation, amplifying their non-radial velocity. We show that the radial velocities of the vortices are not significantly affected by rotation. We study acoustic wave emission and find that it is not sensitive to rotation. Finally, we analyze the impact of the corotation point and find that it has a small impact on the overall acoustic wave emission.
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