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arXiv 1002.2261astro-ph.SR
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满足观测约束的太阳自转磁制动模型

A Model of Magnetic Braking of Solar Rotation That Satisfies Observational Constraints

Pavel A. Denissenkov

摘要:

对Charbonneau & MacGregor(1993)提出的太阳自转磁制动模型进行了修正,使之能够在不与其它观测约束相冲突的情况下,首次再现不同年龄疏散星团中太阳型恒星中最快和最慢自转星的自转演化。如太阳孪晶中大气Li丰度的时间演化和太阳速跃层的薄度。这个新的模型假设旋转驱动的湍流扩散,这被认为是放大恒星辐射区的粘度和磁扩散率,是强烈的各向异性的水平分量的传输系数强烈主导的垂直方向。还考虑到极向场衰减,有助于限制速度跃层的宽度在太阳年龄。利用有限元法数值求解二维动量和磁感耦合方程的方位分量,研究了该模型的性质

英文摘要:

The model of magnetic braking of solar rotation considered by Charbonneau & MacGregor (1993) has been modified so that it is able to reproduce for the first time the rotational evolution of both the fastest and slowest rotators among solar-type stars in open clusters of different ages, without coming into conflict with other observational constraints, such as the time evolution of the atmospheric Li abundance in solar twins and the thinness of the solar tachocline. This new model assumes that rotation-driven turbulent diffusion, which is thought to amplify the viscosity and magnetic diffusivity in stellar radiative zones, is strongly anisotropic with the horizontal components of the transport coefficients strongly dominating over those in the vertical direction. Also taken into account is the poloidal field decay that helps to confine the width of the tachocline at the solar age. The model's properties are investigated by numerically solving the azimuthal components of the coupled momentum and magnetic induction equations in two dimensions using a finite element method

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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