arXiv 2005.087162020-05-18astro-ph.SR

红矮星、红巨星和超巨星的发电机action

The dynamo action for red dwarfs and red giant and supergiant stars

D. V. Sarafopoulos

备注：: 40 pages, 3 figures

摘要：

我们研究了将Sarafopoulos（2017，2019）提出的发电机作用的主要概念应用于红矮星、红巨星和超巨星的可能性。因此，我们试图建立一个统一的发电机行动，潜在的工作在广泛变化的恒星域。因此，产生主要恒星磁场的强大、独特和领先的实体仍然是所谓的环面结构。在圆环内，相同符号的电荷相互吸引，圆环可以被模拟为超导体。旋转速率的现有梯度在环面中积累净电荷，并且所产生的环形电流成为磁场的驱动源。反过来，有一个复杂的次级相互作用网络，影响和调节整个恒星的磁性行为。我们的发电机作用可能在完全和部分对流的恒星中起作用。一个主要的发现是，对于相同光谱类型的恒星，磁场的强度基本上是由恒星的大小控制的;我们认为，恒星越大，环面形成得越深。一个单一的环面的形成基本上是与一个大规模的强，极向和轴对称的磁场拓扑结构，而产生一个较弱的多极，非轴对称的场配置在快速演变可能会导致从一个双环面结构（如太阳的情况）。同样的基本概念是按比例放大或缩小。此外，我们确定了与红矮星、巨星和超巨星的磁场相关的四个关键参数：第一，旋转速度;第二，剪切层中旋转速率径向梯度的陡度;第三，环面与光球的距离;第四，环面的横截面积。第三和第四个关键参数是首次引入的。

英文摘要：

We investigate the possibility to apply the already suggested by Sarafopoulos (2017, 2019) main concept of dynamo action to red dwarfs and red giant and supergiant stars. Thus, we attempt to establish a unified dynamo action, being potentially at work at widely varying stellar domains. Thus, the powerful, unique and leading entity generating the primary stellar magnetic field remains the so-called Torus structure. Within the Torus the same sign charges are mutually attracted and the Torus could be simulated as a superconductor. An existing gradient of the rotation rate accumulates net charge in the Torus, and the resulting toroidal current becomes the driving source of the magnetic field. In turn, there is a complicated network of secondary interactions that affect and modulate the whole star's magnetic behaviour. Our dynamo action is potentially at work in fully and partly convecting stars. A major finding is that the strength of the magnetic field, for stars of the same spectral type, is essentially controlled by the size of the star; we suggest that, the larger the star, the deeper inward the Torus is formed. The formation of a single Torus is essentially associated with a large-scale strong, poloidal and axisymmetric magnetic field topology, whereas the generation of a weaker multipolar, non-axisymmetric field configuration in rapid evolution can result from a double-Torus structure (like the solar case). The same basic concept is scaled up or down. Moreover, we identify four key parameters associated with the magnetic field of red dwarfs, giants and supergiants: First, the rotation speed; second, the steepness of the radial gradient of the rotation rate in the shear layer; third, the distance of the Torus from the photosphere and fourth, the cross-sectional area of the Torus. The third and fourth key parameters are introduced for the first time.

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。

摘要：

英文摘要：

相关论文