Atomic diffusion in star models of type earlier than G
Atomic diffusion in star models of type earlier than G
复制标题
G 型之前的恒星模型中的原子扩散
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
F. Thévenin
中科院分区：
文献类型：
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作者：
P. Morel;F. Thévenin
在恒星演化模型的计算中，我们引入了与辐射粘性有关的辐射扩散率引起的混合。我们发现，辐射扩散系数显著降低了早于≈G的恒星模型外层引力沉降的效率。模型预测的化学物种表面丰度与在KYADES开放星系团成员中测定的丰度进行了成功的比较。我们的建模依赖于一个效率参数，该参数被评估为接近于1的值，我们在这项研究中对其进行了校准。
We introduce the mixing resulting from the radiative diffusivity associated with the radiative viscosity in the calculation of stellar evolution models. We find that the radiative diffusivity significantly diminishes the efficiency of the gravitational settling in the external layers of stellar models corresponding to types earlier than ≈ G. The surface abundances of chemical species predicted by the models are successfully compared with the abundances determined in members of the Hyades open cluster. Our modeling depends on an efficiency parameter, which is evaluated to a value close to unity, that we calibrate in this study.