主序星质量损失后双星螺旋壳模式的模板
Templates of binary-induced spiral-shell patterns around mass-losing post-main sequence stars
摘要：
通过一组三维流体动力学模型模拟，研究了偏心双星系统中质量损失星周围流出的星周包层的形态特征。基于四个模板模型的包络线的角度范围内的系统，我们实现了解释性的工具，在高光谱/角分辨率的观测（如所示，通过速度通道图以及位置速度，半径速度，和角度半径图）。在这个框架内，图像和运动学结构可用于对系统的轨道参数施加约束。具体而言，三个独特的特征模式的信封中发现，区分这些系统从那些在圆轨道的二元系统。螺旋模式的分叉，臂间密度凹陷的不对称性，以及同时出现的螺旋/环形外观都指向一个具有偏心轨道的双星系统。本文提出的方法是说明在最近的无线电观测几个渐近巨星分支星的分析。
英文摘要：
The morphological properties of the outflowing circumstellar envelopes surrounding mass-losing stars in eccentric binary systems are presented from a set of three-dimensional hydrodynamical model simulations. Based on four template models of the envelope viewed for a range of inclination angles of the systems, we implement interpretative tools for observations at high spectral/angular resolutions (as illustrated via velocity channel maps as well as position-velocity, radius-velocity, and angle-radius diagrams). Within this framework, the image and kinematical structures can be used to place constraints on the orbital parameters of the system. Specifically, three unique characteristic patterns in the envelopes are found that distinguish these systems from those in binary systems in circular orbits. Bifurcation of the spiral pattern, asymmetry in the interarm density depression, and a concurrent spiral/ring appearance all point to a binary system with an eccentric orbit. The methodology presented in this paper is illustrated in an analysis of recent radio observations of several asymptotic giant branch stars.
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