Chromospheric activity in several single late-type stars
Chromospheric activity in several single late-type stars
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DOI：
10.1088/1674-4527/15/2/009
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发表时间：
2015-01
影响因子：
1.8
通讯作者：
Li-yun Zhang;Q. Pi;Zhongzhong Zhu
中科院分区：
文献类型：
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作者：
Li-yun Zhang;Q. Pi;Zhongzhong Zhu
2008-2010年利用兴隆站2.16米望远镜获得了6颗晚型类昴星（V368 Cep，EP Eri，DX Leo，GJ 211，PW And和V383 Lac）的新的高分辨率阶梯光谱。利用光谱相减技术，我们分析了我们的光谱数据，计算了几个色球活动指标（Na I D1，D2，Hα和Ca II红外三线）的过量发射的等效宽度。我们使用色球活动指标的所有结果都证实了以前的发现。另外，色球转动调制的最大振幅和EW 8542/EW 8498的比值随着vsin i速度的增加而增加.
New high-resolution echelle spectra of six single late-type Pleiades-like stars (V368 Cep, EP Eri, DX Leo, GJ 211, PW And and V383 Lac) were obtained with the 2.16 meter telescope at Xinglong Station in 2008–2010. Using the spectral subtraction technique, we analyzed our spectroscopic data and calculated the equivalent widths of excess emission from several indicators of chromospheric activity (Na I D1, D2, Hα and Ca II infrared triplet lines). All our results using chromospheric activity indicators confirmed the previous findings. In addition, the maximum amplitudes of chromospheric rotational modulation and the ratio of EW8542/EW8498 were found to rise with increasing v sin i velocity.