A magnetic cycle of τ Bootis? The coronal and chromospheric view
A magnetic cycle of τ Bootis? The coronal and chromospheric view
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τ Bootis 的磁周期？日冕和色球视图
DOI：
10.1002/asna.201111614
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发表时间：
2013
影响因子：
0.9
通讯作者：
J. H. M. M. Schmitt
中科院分区：
文献类型：
--
作者：
K. Poppenhaeger;H. M. Günther;J. H. M. M. Schmitt
牧夫座τ是一颗F型主序星晚期的星星，被一颗热木星环绕。在过去的几年里，分光偏振观测导致了这样一种假设，即这颗星星可能拥有一个全球磁场，每年转换一次极性，这表明它的活动周期很短，只有一年。在我们正在进行的观测活动中，我们已经收集了几个X射线观测与XMM牛顿和光谱与TRES/FLWO在亚利桑那州的特征τ Boo的日冕和色球层在假设的一年周期的过程。与分光偏振重建相反，我们的观察没有显示短活动周期的迹象（© 2011 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆）
τ Bootis is a late F-type main sequence star orbited by a Hot Jupiter. During the last years spectropolarimetric observations led to the hypothesis that this star may host a global magnetic field that switches its polarity once per year, indicating a very short activity cycle of only one year duration. In our ongoing observational campaign, we have collected several X-ray observations with XMM-Newton and optical spectra with TRES/FLWO in Arizona to characterize τ Boo's corona and chromosphere over the course of the supposed one-year cycle. Contrary to the spectropolarimetric reconstructions, our observations do not show indications for a short activity cycle (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)