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arXiv 1502.00706astro-ph.SR
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地震学与年龄/自转/磁活动的关系

Towards age/rotation/magnetic activity relation with seismology

Savita Mathur

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6 pages, 3 figures. Proceedings of the CoRoT3-KASC7 conference: The Space Photometry Revolution
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摘要：

恒星年龄的知识直接影响行星系统的特征，因为它对系统诞生的时刻提出了强有力的约束。不幸的是，确定恒星的精确年龄是一项非常困难的任务。可以使用不同的方法（基于等时线或化学元素丰度）来进行测量，但这些方法通常具有很大的不确定性。在演化过程中，恒星会经历导致角动量损失的过程，但也会发生磁活动的变化。建立恒星自转、磁场、年龄的关系，将是独立推断恒星年龄模型的一项资产。几次尝试建立旋转和年龄之间的经验关系（即陀螺年代学），重点是年龄测定更容易的星团恒星和主序星上的年轻恒星。对于场星，我们现在可以利用高精度的光度观测，我们可以进行星震分析，以提高恒星年龄的准确性。此外，光变曲线的可变性使我们能够对恒星的旋转和磁场活动施加强有力的约束。通过结合这些精确的测量，我们正在了解和改善磁活动，旋转和年龄之间的关系，特别是在恒星演化的不同阶段。我将回顾基于年轻星团恒星观测的陀螺年代学关系的现状。然后，我将集中讨论类太阳恒星，并描述可以通过高质量的光度观测（如开普勒任务的观测），特别是通过星震分析提供的恒星年龄、旋转和磁性的推断。

英文摘要：

The knowledge of stellar ages directly impacts the characterization of a planetary system as it puts strong constraints on the moment when the system was born. Unfortunately, the determination of precise stellar ages is a very difficult task. Different methods can be used to do so (based on isochrones or chemical element abundances) but they usually provide large uncertainties. During its evolution a star goes through processes leading to loss of angular momentum but also changes in its magnetic activity. Building rotation, magnetic, age relations would be an asset to infer stellar ages model independently. Several attempts to build empirical relations between rotation and age (namely gyrochronology) were made with a focus on cluster stars where the age determination is easier and for young stars on the main sequence. For field stars, we can now take advantage of high-precision photometric observations where we can perform asteroseismic analyses to improve the accuracy of stellar ages. Furthermore, the variability in the light curves allow us to put strong constraints on the stellar rotation and magnetic activity. By combining these precise measurements, we are on the way of understanding and improving relations between magnetic activity, rotation, and age, in particular at different stages of stellar evolution. I will review the status on gyrochronology relationships based on observations of young cluster stars. Then I will focus on solar-like stars and describe the inferences on stellar ages, rotation, and magnetism that can be provided by high-quality photometric observations such as the ones of the Kepler mission, in particular through asteroseismic analyses.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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