论文标题
关于恒星活性周期二分法的起源
On the origin of the dichotomy of stellar activity cycles
论文作者
论文摘要
恒星旋转率$ω$与活动周期$ω__\ mathrm {Cyc} $之间可能存在的相关性存在很多争议。我们基于对多个缩放定律的同时回归分析来实现一种新的贝叶斯分类算法，我们证明了在$ \ log_ {10}ω__\ Mathrm {cyc} $ - $ \ log_ {10} $ {10}ω$飞机中，有两个不同的比例存在于67 star的样品。得益于从ESA GAIA和高分辨率光谱获得的金属度测量值，我们认为该二分法的起源可能与化学成分有关：磁性周期频率随旋转速率增加的恒星比磁性周期降低的恒星降低的恒星降低，其磁循环频率随着恒星旋转速率而降低。相反，色圈磁性活性指标没有明显的差异来表征这两个分支。
The presence of possible correlations between stellar rotation rate $Ω$ and the frequency of the activity cycle $ω_\mathrm{cyc}$ is still much debated. We implement a new Bayesian classification algorithm based on a simultaneous regression analysis of multiple scaling laws and we demonstrate the existence of two different scalings in the $\log_{10} ω_\mathrm{cyc}$ -- $\log_{10} Ω$ plane for an extended Mt.~Wilson sample of 67 stars. Thanks to metallicity measurements obtained from both ESA Gaia and high-resolution spectroscopy, we argue that the origin of this dichotomy is likely related to the chemical composition: stars whose magnetic cycle frequency increases with rotation rate are less metallic than stars whose magnetic cycle frequency decreases with stellar rotation rates. On the contrary, no clear difference in chromospheric magnetic activity indicators characterizes the two branches.
