Magnetic flux emergence across the Hertzsprung-Russell diagram

赫罗图上的磁通量出现

• 批准号: 224559602
• 负责人: Dr. Rainer Arlt
• 金额: --
• 依托单位: Leibniz-Institut für Astrophysik Potsdam (AIP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/224559602?language=en
• 关键词: Magnetic; flux; emergence; across; Hertzsprung

The observations of starspots by photometric and spectroscopic methods as well as the detection of magnetic fields on a variety of stars motivates numerical studies of how magnetic flux emerges at the surfaces of these stars. This project aims at the numerical simulation of magnetic flux-rise in a wide range of stars with convective envelopes with emphasis on young dwarfs. Their faster rotation delivers suitable observational material for comparisons. The computations will employ magnetic-field distributions expected from state-of-the-art mean-field models as well as the differential rotation expected from models of rotating convection. The proposed simulations will complement the experience gathered on the problem of magnetic flux-rise in the solar convection zone.Compressible models as the ones propose here, are a must for convective envelopes of red giants in which convective velocities are no longer very small compared to the sound speed. We therefore focus not only on the early evolution of dwarf stars, but on the starspot emergence on giants as well.

通过光度和光谱方法对恒星黑子的观测以及对各种恒星磁场的探测，激发了对这些恒星表面磁通量如何出现的数值研究。该项目旨在数值模拟具有对流包层的大范围恒星的磁通量上升，重点是年轻的矮星。它们更快的自转为比较提供了合适的观测材料。计算将采用最先进的平均场模型预期的磁场分布以及旋转对流模型预期的差分旋转。拟议的模拟 将补充在太阳对流区的磁通量上升的问题上收集的经验。这里提出的可压缩模型，是红巨星对流包络的必须条件，其中对流速度与声速相比不再很小。因此，我们不仅关注矮星的早期演化，也关注巨星上的星点出现。

项目成果

3D simulations of rising magnetic flux tubes in a compressible rotating interior: The effect of magnetic tension

可压缩旋转内部磁通量管上升的 3D 模拟：磁张力的影响

• DOI: 10.1051/0004-6361/201629989
• 发表时间: 2017
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Fournier;Ziegler;Strassmeier
• 通讯作者: Strassmeier