Stellar models with microscopic diffusion and rotational mixing 1.: Application to the Sun
Stellar models with microscopic diffusion and rotational mixing 1.: Application to the Sun
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DOI：
10.1086/175408
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发表时间：
1994-08
期刊：
影响因子：
--
通讯作者：
B. Chaboyer;P. Demarque;M. Pinsonneault
中科院分区：
文献类型：
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作者：
B. Chaboyer;P. Demarque;M. Pinsonneault
耶鲁恒星演化代码已被修改，包括扩散和旋转混合对 H-1、H-4 以及微量元素 He、Li-6、Li-7 和 Be-9 的综合影响。通过计算多个校准的太阳模型来研究旋转混合和扩散之间的相互作用。旋转混合抑制模型外部的扩散，导致包络扩散减少 25%-50%。相反，扩散导致平均分子量梯度，这会抑制旋转混合。平均分子量梯度抑制旋转混合的程度有些不确定。与观察到的日光扁率的比较表明，平均分子量梯度在抑制旋转混合方面的作用比之前认为的要小。具有平均分子量对旋转混合的抑制作用的标准值的模型不会耗尽主序列上的Li，这一事实进一步强化了这一点。这与观察结果形成鲜明对比。平均分子量梯度的抑制作用降低了 10 倍，导致主序锂明显耗尽。
The Yale stellar evolution code has been modified to include the combined effects of diffusion and rotational mixing on H-1, H-4, and the trace elements He, Li-6, Li-7, and Be-9. The interaction between rotational mixing and diffusion is studied by calculating a number of calibrated solar models. The rotational mixing inhibits the diffusion in the outer parts of the models, leading to a decrease in the envelope diffusion by 25%-50%. Conversely, diffusion leads to gradients in mean molecular weight which can inhibit the rotational mixing. The degree to which gradients in mean molecular weight inhibit the rotational mixing is somewhat uncertain. A comparison with the observed solar oblateness suggests that gradients in the mean molecular weight play a smaller role in inhibiting the rotational mixing than previously believed. This is reinforced by the fact that the model with the standard value for the inhibiting effect of mean molecular weight on the rotational mixing depletes no Li on the main sequence. This is clear in contrast to the observations. A reduction in the inhibiting effect of mean molecular weight gradients by a factor of 10 loads to noticeable main-sequence Li depletion.