恒星磁活动周期的星震特征
Asteroseismic Signatures of Stellar Magnetic Activity Cycles
摘要：
对恒星活动周期的观测为研究许多不同物理条件下的磁发电机提供了机会。空间星震学飞行任务不久将对孕育这种磁循环的内部条件产生有用的限制，并将足够敏感，能够探测到由于磁变化而引起的振荡频率的变化。我们推导出一种方法来预测这些变化的Mg II活动指数的变化，从太阳能数据缩放。我们证明了这种技术的太阳型亚巨星β海，使用档案国际紫外线探测器光谱和两个时代的地面asteroseismic观测。我们找到了预期频率变化的定性证据，并预测了未来对这颗恒星进行星震观测的最佳时机。
英文摘要：
Observations of stellar activity cycles provide an opportunity to study magnetic dynamos under many different physical conditions. Space-based asteroseismology missions will soon yield useful constraints on the interior conditions that nurture such magnetic cycles, and will be sensitive enough to detect shifts in the oscillation frequencies due to the magnetic variations. We derive a method for predicting these shifts from changes in the Mg II activity index by scaling from solar data. We demonstrate this technique on the solar-type subgiant beta Hyi, using archival International Ultraviolet Explorer spectra and two epochs of ground-based asteroseismic observations. We find qualitative evidence of the expected frequency shifts and predict the optimal timing for future asteroseismic observations of this star.
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