EY Dra上的光球和色球活动
Photospheric and chromospheric activity on EY Dra
摘要：
对M矮星EY Dra的光球层和色球层的磁活动进行了研究，并利用V和R波段的光度观测以及光学和近红外光谱学研究了两者之间可能存在的相关性。光球中的纵向斑点配置是从V波段测光获得的，色球结构的研究使用的H α线轮廓和帕邢β线的观测的变化。V波段光变曲线的形状表明恒星表面有两个活动区域，相位差约为0.4。光谱观测显示，在光度测量检测到的星点附近观察到增强的H α发射。这可能表明色球斑与光球星点有关。还发现了一些突出结构的迹象。色球层的压力被限制在logTR < -4，因为在帕邢β波长区域没有探测到辐射。
英文摘要：
Magnetic activity in the photosphere and chromosphere of the M dwarf EY Dra is studied and possible correlations between the two are investigated using photometric observations in the V and R bands and optical and near infrared spectroscopy. The longitudinal spot configuration in the photosphere is obtained from the V band photometry, and the chromospheric structures are investigated using variations in the H alpha line profile and observations of the Paschen beta line. The shape of the V band light-curve indicates two active regions on the stellar surface, about 0.4 in phase apart. The spectroscopic observations show enhanced H alpha emission observed close to the phases of the photometrically detected starspots. This could indicate chromospheric plages associated with the photospheric starspots. Some indications of prominence structures are also seen. The chromospheric pressure is limited to logTR < -4 based on the non-detection of emission in the Paschen beta wavelength region.
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。
