MAGNETIC ACTIVITY ANALYSIS FOR A SAMPLE OF G-TYPE MAIN SEQUENCE KEPLER TARGETS
MAGNETIC ACTIVITY ANALYSIS FOR A SAMPLE OF G-TYPE MAIN SEQUENCE KEPLER TARGETS
复制标题
DOI：
10.3847/1538-4357/834/2/207
复制
发表时间：
2016-11
期刊：
影响因子：
--
通讯作者：
A. Mehrabi;Han He;H. Khosroshahi
中科院分区：
文献类型：
--
作者：
A. Mehrabi;Han He;H. Khosroshahi
由于恒星表面磁性特征（星黑子和光斑）的旋转调制而导致的恒星光变曲线的变化可用于研究主星的磁性。在本文中，我们使用光曲线变化的周期性和幅度作为两个代理来研究最近确定了自转周期的 G 型主序带开普勒目标大样本的恒星磁特性。通过分析这两个磁代理之间的相关性，发现：（1）对于我们样本中的大多数恒星来说，这两个代理都呈正相关，负相关、零相关和正相关的比例分别为4.27%、6.81%和88.91%； (2)负相关星不能有大幅度的光变变化； (3)随着自转周期的增加，正相关星的相对数量减少，负相关星的相对数量增加。这些结果表明，自转周期较短的恒星往往在两个代理之间具有正相关性，并且很大一部分正相关恒星比负相关恒星具有更大的光曲线变化幅度（因此磁活动更强烈）。
The variation of a stellar light curve owing to rotational modulation by magnetic features (starspots and faculae) on the star’s surface can be used to investigate the magnetic properties of the host star. In this paper, we use the periodicity and magnitude of the light-curve variation as two proxies to study the stellar magnetic properties for a large sample of G-type main sequence Kepler targets, for which the rotation periods were recently determined. By analyzing the correlation between the two magnetic proxies, it is found that: (1) the two proxies are positively correlated for most of the stars in our sample, and the percentages of negative, zero, and positive correlations are 4.27%, 6.81%, and 88.91%, respectively; (2) negative correlation stars cannot have a large magnitude of light-curve variation; and (3) with the increase of rotation period, the relative number of positive correlation stars decreases and the negative correlation one increases. These results indicate that stars with shorter rotation period tend to have positive correlation between the two proxies, and a good portion of the positive correlation stars have a larger magnitude of light-curve variation (and hence more intense magnetic activities) than negative correlation stars.