Roche势中恒星风的动力学：（i）与天文脉泽有关的外流和周期性，（ii）斜压性的产生
Dynamics of stellar wind in a Roche potential: implications for (i) outflows & periodicities relevant to astronomical masers, and (ii) generation of baroclinicity
摘要：
我们研究的动力学恒星风从一个机构的双星系统，其中另一个机构只相互作用的引力。我们专注于以下三个问题：（i）我们探索的起源观察到的脉泽强度的周期性变化;（ii）我们解决的性质，双极分子外流;（iii）我们显示在相同的模型设置的斜压性的产生。从直接数值模拟和进一步的数值模拟，我们发现，脉泽强度沿一个给定的视线周期性变化，由于材料密度的周期性调制。该调制周期是二进制周期的数量级。该模式的另一个特点是，在风演变的后期，气流的速度结构随时间保持不变。因此，在选定的视线上，脉泽点的位置保持在同一空间位置，从而自然地解释了观测事实。在标准位置-速度图中，这也给出了双极性质的外观，正如在许多分子流出中所观察到的那样。值得注意的是，我们还发现了斜压性的产生在流周围的双系统，提供了另一个网站，种子磁场可能产生的，由于比尔曼电池机制，在星系内。
英文摘要：
We study the dynamics of stellar wind from one of the bodies in the binary system, where the other body interacts only gravitationally. We focus on following three issues: (i) we explore the origin of observed periodic variations in maser intensity; (ii) we address the nature of bipolar molecular outflows; and (iii) we show generation of baroclinicity in the same model setup. From direct numerical simulations and further numerical modelling, we find that the maser intensity along a given line of sight varies periodically due to periodic modulation of material density. This modulation period is of the order of the binary period. Another feature of this model is that the velocity structure of the flow remains unchanged with time in late stages of wind evolution. Therefore the location of the masing spot along the chosen sightline stays at the same spatial location, thus naturally explaining the observational fact. This also gives an appearance of bipolar nature in the standard position-velocity diagram, as has been observed in a number of molecular outflows. Remarkably, we also find the generation of baroclinicity in the flow around binary system, offering another site where the seed magnetic fields could possibly be generated due to the Biermann battery mechanisms, within galaxies.
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