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arXiv 0805.4529astro-ph
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双星碰撞风的三维动力学模型

A 3D dynamical model of the colliding winds in binary systems

E. R. Parkin, J. M. Pittard

摘要:

提出了一个双星系统中风-风碰撞区轨道诱导曲率的三维动力学模型。动量平衡方程被用来确定恒星之间的接触不连续的位置和形状,而进一步下游的气体被假定为弹道行为。阿基米德螺旋结构是由恒星的运动形成的,与所谓的“风车星云”的高分辨率图像非常相似。这种方法的网格或光滑粒子流体动力学模型的一个关键优势是其显着降低计算成本,同时它也允许在偏心轨道中获得的结构的研究。该模型是相关的共生系统和伽玛射线双星,以及系统的O型和沃尔夫-拉叶星。作为一个例子的应用程序,我们模拟的X射线发射从假设的O+O和WR+O星双星,并描述了一种方法的射线追踪通过三维螺旋结构占吸收的拱星材料的系统。这样的计算可以很容易地适用于研究从无线电到伽马射线波长范围内的观测。

英文摘要:

We present a 3D dynamical model of the orbital induced curvature of the wind-wind collision region in binary star systems. Momentum balance equations are used to determine the position and shape of the contact discontinuity between the stars, while further downstream the gas is assumed to behave ballistically. An archimedean spiral structure is formed by the motion of the stars, with clear resemblance to high resolution images of the so-called ``pinwheel nebulae''. A key advantage of this approach over grid or smoothed particle hydrodynamic models is its significantly reduced computational cost, while it also allows the study of the structure obtained in an eccentric orbit. The model is relevant to symbiotic systems and Gamma-ray binaries, as well as systems with O-type and Wolf-Rayet stars. As an example application, we simulate the X-ray emission from hypothetical O+O and WR+O star binaries, and describe a method of ray tracing through the 3D spiral structure to account for absorption by the circumstellar material in the system. Such calculations may be easily adapted to study observations at wavelengths ranging from the radio to Gamma-ray.

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