Mira变星的动态不透明度抽样模型。I：建模描述和近似分析
Dynamical Opacity-Sampling Models of Mira Variables. I: Modelling Description and Analysis of Approximations
摘要：
我们描述了冷不透明度采样动态扩展（CODEX）的Mira变星的大气模型，并详细研究了物理和数值近似模型的创建。CODEX大气模型是通过计算大气层的温度、化学和辐射状态而获得的，假设来自Mira脉动模型的气体压力和速度分布，从氢燃烧壳附近延伸到大气层的外层。虽然该代码使用的近似本地热力学平衡（LTE）和灰色近似的动力学大气代码，许多关键的可观测量，如红外线直径和低分辨率光谱，预测鲁棒性，尽管这些近似。我们发现，在可见光，辐射从米拉变量主要是由荧光散射过程，LTE近似可能低于预测可见波段通量的一个因素。
英文摘要：
We describe the Cool Opacity-sampling Dynamic EXtended (CODEX) atmosphere models of Mira variable stars, and examine in detail the physical and numerical approximations that go in to the model creation. The CODEX atmospheric models are obtained by computing the temperature and the chemical and radiative states of the atmospheric layers, assuming gas pressure and velocity profiles from Mira pulsation models, which extend from near the H-burning shell to the outer layers of the atmosphere. Although the code uses the approximation of Local Thermodynamic Equilibrium (LTE) and a grey approximation in the dynamical atmosphere code, many key observable quantities, such as infrared diameters and low-resolution spectra, are predicted robustly in spite of these approximations. We show that in visible light, radiation from Mira variables is dominated by fluorescence scattering processes, and that the LTE approximation likely under-predicts visible-band fluxes by a factor of two.
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