Angular momentum transport and element mixing in the stellar interior. I. Application to the rotating Sun

Angular momentum transport and element mixing in the stellar interior. I. Application to the rotating Sun
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恒星内部的角动量传输和元素混合。

DOI:
10.1051/0004-6361:20053577
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发表时间:
2006-04
影响因子:
6.5
通讯作者:
--
中科院分区:
物理与天体物理2区
文献类型:
--
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目标。这项工作的目的是得到旋转太阳模型中磁角动量输运和物质输运的扩散系数。方法:研究方法。我们假设磁场引起的角动量输运和化学元素输运都可以看作是一个扩散过程。结果。扩散系数取决于恒星的半径、角速度和磁场的配置。利用这个系数,我们发现我们的模型与日震的总角动量、角动量密度以及辐射区的自转速度的结果比没有磁场的模型更符合。磁场不仅可以有效地重新分配角动量,而且还可以加强辐射区和对流区之间的耦合。结果,在对流区底部,旋转速度的急剧梯度减小。在我们的模型中,径向旋转速度急剧变化的那一层的厚度大约是0.036个R圆点。此外,通过混合与角动量输运有关的材料,改善了地震太阳与模型之间的声速平方差。
Aims. The purpose of this work was to obtain diffusion coefficient for the magnetic angular momentum transport and material transport in a rotating solar model. Methods. We assumed that the transport of both angular momentum and chemical elements caused by magnetic fields could be treated as a diffusion process. Results. The diffusion coefficient depends on the stellar radius, angular velocity, and the configuration of magnetic fields. By using of this coefficient, it is found that our model becomes more consistent with the helioseismic results of total angular momentum, angular momentum density, and the rotation rate in a radiative region than the one without magnetic fields. Not only can the magnetic fields redistribute angular momentum efficiently, but they can also strengthen the coupling between the radiative and convective zones. As a result, the sharp gradient of the rotation rate is reduced at the bottom of the convective zone. The thickness of the layer of sharp radial change in the rotation rate is about 0.036 R-circle dot in our model. Furthermore, the difference of the sound-speed square between the seismic Sun and the model is improved by mixing the material that is associated with angular momentum transport.
DOI: 10.1086/308050
发表时间: 1999-12-10
影响因子: 4.9
作者:
Charbonneau, P;Christensen-Dalsgaard, J;Tomczyk, S
通讯作者: Tomczyk, S
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