三维流体动力学恒星大气的微观和宏观湍流
Micro- and macroturbulence derived from 3D hydrodynamical stellar atmospheres
摘要：
微观和宏观湍流（xi_mic和xi_mac）作为恒星参数的函数的理论预测可以是有用的光谱工作的基础上的1D模型大气中的情况下，经验确定的xi_mic是不可能的，由于缺乏合适的线和/或宏观湍流和旋转线展宽是难以分开的。为了利用CIFIST 3D模型大气网格推导出有效温度，重力和金属丰度的xi_mic和xi_mac的理论依赖性，我们讨论了不同的方法来推导出xi_mic的数值模拟，并报告了太阳和南河三的第一个结果。在这两种情况下，初步分析表明，在模拟中发现的微湍流显着低于在真实的恒星大气。
英文摘要：
The theoretical prediction of micro- and macroturbulence (xi_mic and xi_mac) as a function of stellar parameters can be useful for spectroscopic work based on 1D model atmospheres in cases where an empirical determination of xi_mic is impossible due to a lack of suitable lines and/or macroturbulence and rotational line broadening are difficult to separate. In an effort to exploit the CIFIST 3D model atmosphere grid for deriving the theoretical dependence of xi_mic and xi_mac on effective temperature, gravity, and metallicity, we discuss different methods to derive xi_mic from the numerical simulations, and report first results for the Sun and Procyon. In both cases the preliminary analysis indicates that the microturbulence found in the simulations is significantly lower than in the real stellar atmospheres.
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