论文标题
基于苔丝光度法和地面光谱法对HD 134319的磁活性的研究
An investigation of the magnetic activity of HD 134319 based on TESS photometry and ground-based spectroscopy
论文作者
论文摘要
我们介绍了使用TESS在1995-2013年期间，使用TESS高精度光度法对HD 134319上的星形特性和色层活性进行了分析。我们将两点模型应用于确定的周期$ p = 4.436391 \ pm0.00137 $ DAY来模拟在苔丝光曲线上滑动的块，并通过从单个谱从各个谱从各个谱从整体谱从整体谱中删除CA II H和K，H $β$和H $β$和H $β$和H $β$和H $α$排放的相对宽度。发现两点配置，即，主要的，缓慢发展的且持久的位置（P）加上次要且迅速发展的点（S），尽管实际的星形分布无法从收集的数据中得出，但仍能解释数据。尽管在最佳拟合溶液中揭示了斑点半径的变性，但p和s半径之间的突然交替，随后在T1中逐渐降低了S中的S逐渐减小，并且P和S从T1到T2的降低都是显着的，对应于磁性活性的演变。此外，S揭示了旋转和振荡经度的迁移在T1中同步为P，但迁移比T2中的P要大得多。这可能表明内部磁性构型的演变。发现色球活性指标彼此之间紧密相关，并显示出旋转调制以及排放的长期降低，这意味着HD 134319上磁性效率的存在和演变。
We present analysis of the starspot properties and chromospheric activity on HD 134319 using high precision photometry by TESS in sectors 14-16 (T1), 21-23 (T2) and high-resolution spectroscopy by OHP/ELODIE and Keck/HIRES during years 1995-2013. We applied a two-spot model with GLS determined period $P=4.436391\pm0.00137$ day to model chunks sliding over TESS light curve, and measured relative equivalent widths of Ca II H and K, H$β$ and H$α$ emissions by subtracting overall spectrum from individual spectrum. It was found that a two-spot configuration, i.e. a primary, slowly evolving and long-lasting spot (P) plus a secondary and rapidly evolving spot (S), was capable of explaining the data, although the actual starspot distribution is unable to derived from collected data. Despite the spot radius-latitude degeneracy revealed in the best-fit solutions, a sudden alternation between P and S radii followed by gradual decrease of S in T1 and the decrease of both P and S from T1 to T2 were significant, corresponding to the evolution of magnetic activity. Besides, S revealed rotation and oscillatory longitude migration synchronized to P in T1, but held much larger migration than P in T2. This might indicate the evolution of internal magnetic configuration. Chromospheric activity indicators were found to tightly correlated with each other and revealed rotational modulation as well as a long-term decrease of emissions, implying the existence and evolution of magnetic acitivity on HD 134319.
