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arXiv 0810.4361astro-ph
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大质量恒星周围风吹气泡中的Turbulence

Turbulence in Wind-Blown Bubbles around Massive Stars

Vikram V Dwarkadas

摘要:

来自大质量恒星(大于8个太阳质量)的恒星风会在这些恒星周围形成风吹的“气泡”。在本文中,我们研究,通过二维数值流体动力学模拟,在这些风吹“气泡”的形成和演变过程中的湍流的发生和增长。我们的模拟揭示了在主序列阶段的演变过程中形成的涡卷,和瑞利-泰勒不稳定性在随后的阶段,由于加速和/或减速风吹壳。在恒星死亡之前,气泡内部呈现出一种非常动荡的状态,相当大比例的内能消耗在非径向运动上。这将影响随后的超新星冲击波的演化。我们讨论了这些结果的影响,显示如何在径向与非径向运动的动能的比例在整个演变的变化,并讨论这些结果将如何结转到三维。

英文摘要:

Winds from massive stars (> 8 solar masses) result in the formation of wind-blown "bubbles" around these stars. In this paper we study, via two-dimensional numerical hydrodynamic simulations, the onset and growth of turbulence during the formation and evolution of these wind-blown "bubbles". Our simulations reveal the formation of vortex rolls during the Main-Sequence stage of the evolution, and Rayleigh-Taylor instabilities in the subsequent stages due to accelerating and/or decelerating wind-blown shells. The bubble shows a very turbulent interior just prior to the death of the star, with a significant percentage of the internal energy expended in non-radial motions. This would affect the subsequent evolution of the resultant supernova shock wave. We discuss the implications of these results, show how the ratio of kinetic energy in radial versus non-radial motions varies throughout the evolution, and discuss how these results would carry over to three dimensions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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