Origin and structure of magnetic fields in cool stars (A16)

冷恒星磁场的起源和结构 (A16)

• 批准号: 239810588
• 金额: --
• 依托单位: Max-Planck-Institut für Sonnensystemforschung (MPS)
• 依托单位国家: 德国
• 项目类别: Collaborative Research Centres
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/239810588?language=en
• 关键词: Origin; structure; magnetic; fields; cool

The generation of magnetic flux in electrically conducting fluids in turbulent motion is of fundamental importance for understanding magnetohydrodynamic turbulence at large Reynolds numbers. This Project ventures an interdisciplinary approach to address the astrophysical and turbulence aspects of stellar surface magnetism by using radiative MHD simulations of nearsurface stellar magnetoconvection on the one hand, and by obtaining reliable quantitative observations of magnetic fields in stars from sun-like to very-low mass stars on the other. The project consists of two parts: the first continuing our successful simulations of expected signatures of stellar magnetic fields using the MURaM code, the second observing magnetic fields in low-mass stars using different approaches including collaborations in the international BCool project and analysis of 300 stars, i.e., more than ten thousand spectra from the CAR-MENES project.

在湍流运动中导电流体中磁通量的产生对于理解大雷诺数下的磁流体动力学湍流具有根本的重要性。该项目采用跨学科的方法，一方面利用近地表恒星磁对流的辐射MHD模拟，另一方面通过获得从类太阳恒星到极低质量恒星的磁场的可靠定量观测，来解决恒星表面磁性的天体物理和湍流方面。该项目由两部分组成：第一部分继续使用MURaM代码成功模拟恒星磁场的预期特征，第二部分使用不同的方法观察低质量恒星的磁场，包括国际BCool项目的合作和对300颗恒星的分析，即，超过一万个来自CAR-MENES项目的光谱。