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Solar-type dynamo behaviour in fully convective stars without a tachocline

机译:完全没有对流星的全对流恒星中太阳型发电机的行为

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摘要

In solar-type stars (with radiative cores and convective envelopes like our Sun), the magnetic field powers star spots, flares and other solar phenomena, as well as chromospheric and coronal emission at ultraviolet to X-ray wavelengths. The dynamo responsible for generating the field depends on the shearing of internal magnetic fields by differential rotation(1,2). The shearing has long been thought to take place in a boundary layer known as the tachocline between the radiative core and the convective envelope(3). Fully convective stars do not have a tachocline and their dynamo mechanism is expected to be very different(4), although its exact form and physical dependencies are not known. Here we report observations of four fully convective stars whose X-ray emission correlates with their rotation periods in the same way as in solar-type stars. As the X-ray activity-rotation relationship is a well-established proxy for the behaviour of the magnetic dynamo, these results imply that fully convective stars also operate a solar-type dynamo. The lack of a tachocline in fully convective stars therefore suggests that this is not a critical ingredient in the solar dynamo and supports models in which the dynamo originates throughout the convection zone.
机译:在太阳型恒星(具有辐射核心和对流包膜,如我们的太阳)中,磁场为恒星斑,耀斑和其他太阳现象以及紫外线至X射线波长的色球和日冕发射提供动力。负责产生磁场的发电机取决于差速旋转对内部磁场的剪切作用(1,2)。长期以来一直认为剪切作用发生在辐射核心和对流包膜之间的边界线,称为速动线(3)。尽管对流星的确切形式和物理依存度尚不清楚,但完全对流恒星没有塔曲线,并且它们的发电机机制也有很大差异(4)。在这里,我们报告了对四个完全对流星的观测,它们的X射线发射与自转周期相关,其方式与太阳型星相同。由于X射线的活动-自转关系是磁发电机行为的公认代表,因此这些结果表明,完全对流的恒星也运行着太阳型发电机。因此,在完全对流的恒星中缺乏速动线,这表明这不是太阳发电机中的关键要素,并支持了其中发电机在整个对流区起源的模型。

著录项

  • 来源
    《Nature》 |2016年第7613期|526-528|共3页
  • 作者单位

    Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England;

    Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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