$τ$牧夫座星系的磁拓扑演化
The Evolving Magnetic Topology of $τ$ Boötis
摘要：
我们提出了六个时代的光谱偏振观测的热木星托管恒星$τ$牧夫座，扩展了特殊的前多年的数据集，其大规模的磁场。我们的研究结果证实，$τ$牧夫座的大规模磁场周期性变化，并观察到两个进一步的磁场逆转; 2013年12月和2014年5月之间和2015年1月和3月之间。我们还表明，该领域的演变，在广泛的太阳型的方式相比，其他F型恒星。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，这将表明一个非常快速的磁循环。作为长期磁场演化的典范，$τ$牧夫座和这一长期监测活动为研究恒星磁循环提供了一个独特的机会。
英文摘要：
We present six epochs of spectropolarimetric observations of the hot-Jupiter-hosting star $τ$ Boötis that extend the exceptional previous multi-year data set of its large-scale magnetic field. Our results confirm that the large-scale magnetic field of $τ$ Boötis varies cyclicly, with the observation of two further magnetic reversals; between December 2013 and May 2014 and between January and March 2015. 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, $τ$ Boötis and this longterm monitoring campaign presents a unique opportunity for studying stellar magnetic cycles.
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