Seismic study of solar convection and overshooting: results of nonlocal convection

Seismic study of solar convection and overshooting: results of nonlocal convection
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太阳对流和超调的地震研究:非局域对流的结果

DOI:
10.1088/1674-4527/13/9/011
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发表时间:
2013-05
影响因子:
1.8
通讯作者:
Christensen-Dalsgaard, Jorgen
Christensen-Dalsgaard, Jorgen
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhang, Chun-Guang;Deng, Li-Cai;Xiong, Da-Run;Christensen-Dalsgaard, Jorgen

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局域混合长度理论无法描述恒星对流中的非局域现象,例如超调。因此,用局部混合长度理论构建的标准太阳模型在对流区边界处显着偏离太阳,在对流区边界处对流效率较低并且非局部效应很重要。观测到的频率和计算出的频率之间的差异主要来自于表面附近的区域,而声速的局部差异正好位于对流包络线以下。我们利用熊的非局域对流理论计算了太阳包络线模型,并进行了日震分析。正如日震学所揭示的,非局域模型在对流区底部具有平滑过渡。它可以更准确地再现太阳频率,并减少太阳和标准太阳模型之间声速的局部差异。
Local mixing-length theory is incapable of describing nonlocal phenomena in stellar convection, such as overshooting. Therefore standard solar models constructed with local mixing-length theory significantly deviate from the Sun at the boundariesof the convection zone, where convection becomes less efficient and nonlocal effects are important. The differences between observed and computed frequencies mainly come from the region near the surface, while the localized difference in sound speed is just below the convective envelope. We compute a solar envelope model using Xiong's nonlocal convection theory, and carry out helioseismic analysis. The nonlocal model has a smooth transition at the base of the convection zone, as revealed by helioseismology. It reproduces solar frequencies more accurately, and reduces the localized difference in sound speed between the Sun and standard solar models.
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