The evolving magnetic topology of τ Boötis
The evolving magnetic topology of τ Boötis
复制标题
τ Bootis 不断演化的磁拓扑
DOI：
10.1093/mnras/stw828
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发表时间：
2016
影响因子：
4.8
通讯作者：
the Bcool Collaboration
中科院分区：
文献类型：
--
作者：
M. Mengel;R. Fares;S. Marsden;B. Carter;S. Jeffers;P. Petit;J. Donati;C. Folsom;the Bcool Collaboration
我们提出了对热木星 tau Bootis 恒星进行的六个时期的分光偏振观测，这些观测扩展了其大规模磁场的先前多年数据集。我们的结果证实了 tau Bootis 的大尺度磁场周期性变化，并观察到了两次进一步的磁反转； 2013年12月至2014年5月以及2015年1月至3月。我们还表明，与其他 F 型恒星相比，该场以大致太阳类型的方式演化。我们进一步提出了新的结果，表明色球活动周期和磁活动周期是相关的，这表明磁周期非常快。作为长期磁场演化的典范，tau Bootis 和这项长期监测活动为研究恒星磁循环提供了独特的机会。
We present six epochs of spectropolarimetric observations of the hot-Jupiter-hosting star tau Bootis that extend the exceptional previous multiyear data set of its large-scale magnetic field. Our results confirm that the large-scale magnetic field of tau Bootis varies cyclicly, with the observation of two further magnetic reversals; between 2013 December and 2014 May and between 2015 January and March. We also show that the field evolves in a broadly solar-type manner in contrast to other F-type stars. We further present new results which indicate that the chromospheric activity cycle and the magnetic activity cycles are related, which would indicate a very rapid magnetic cycle. As an exemplar of long-term magnetic field evolution, tau Bootis and this long-term monitoring campaign presents a unique opportunity for studying stellar magnetic cycles.