标题： 恒星磁周期 显示英文标题

标题： Stellar magnetic cycles

摘要： 太阳活动周期是我们恒星内部磁流体力学发电机工作的表现形式。 检测类似太阳的恒星中的活动周期及其性质研究使我们能够从更广阔的视角理解太阳发电机，探讨发电机作用如何依赖于恒星参数和恒星结构。 然而，恒星光谱数据的空间分辨率不足以及时间跨度有限限制了我们对恒星周期的理解，也限制了我们约束发电机模型的可能性。 我简要回顾了一些通过恒星磁场的积分代理获得的结果，并讨论了由MOST、CoRoT、开普勒和盖亚空间望远镜提供的空间光度测量以及新的地面光谱或光谱偏振观测带来的新机会。 恒星周期对晚期活动恒星的能量输出和周围的磁场所有显著影响，这会影响恒星与行星之间的相互作用。 另一方面，一颗近距离的大质量行星可能会影响其宿主恒星的活动性。 最近的观测提供了这种相互作用的间接证据，并可能对恒星活动周期产生影响。 显示英文摘要

摘要： The solar activity cycle is a manifestation of the hydromagnetic dynamo working inside our star. The detection of activity cycles in solar-like stars and the study of their properties allow us to put the solar dynamo in perspective, investigating how dynamo action depends on stellar parameters and stellar structure. Nevertheless, the lack of spatial resolution and the limited time extension of stellar data pose limitations to our understanding of stellar cycles and the possibility to constrain dynamo models. I briefly review some results obtained from disc-integrated proxies of stellar magnetic fields and discuss the new opportunities opened by space-borne photometry, made available by MOST, CoRoT, Kepler, and GAIA, and by new ground-based spectroscopic or spectropolarimetric observations. Stellar cycles have a significant impact on the energetic output and circumstellar magnetic fields of late-type active stars which affects the interaction between stars and their planets. On the other hand, a close-in massive planet could affect the activity of its host star. Recent observations provide circumstantial evidence of such an interaction with possible consequences for stellar activity cycles.