Vortices in the wakes of AGB stars

Vortices in the wakes of AGB stars
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AGB 恒星尾迹中的漩涡

DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
T. O’brien
T. O’brien
中科院分区：
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文献类型：
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作者：
C. Wareing;A. Zijlstra;T. O’brien

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在宇宙中，涡旋被假定为一系列的尺度，包括恒星尺度。在流体力学模拟一颗渐近巨星分支恒星穿过并席卷其周围星际介质的风的过程中，我们发现了10−1 pC到10 1pC大小的旋涡。这些漩涡似乎是AGB恒星上游形成的弓激波头部不稳定的结果。不稳定性剥离ff下游，并在弓激波后的AGB物质尾部形成涡旋，与周围的ISM混合。我们认为在行星状星云Sh2-188中可以看到这样的结构。
Vortices have been postulated at a range of size scales in the universe includ-ing at the stellar size-scale. Whilst hydrodynamically simulating the wind from an asymptotic giant branch (AGB) star moving through and sweeping up its surrounding interstellar medium (ISM), we have found vortices on the size scale of 10 − 1 pc to 10 1 pc in the wake of the star. These vortices appear to be the result of instabilities at the head of the bow shock formed upstream of the AGB star. The instabilities peel off downstream and form vortices in the tail of AGB material behind the bow shock, mixing with the surrounding ISM. We suggest such structures are visible in the planetary nebula Sh 2-188.