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Revisiting Ca II Activity Indices in FGK Stars: Systematic Biases in Infrared Triplet Measurements

  • Authors: Xiaozhen Yang, 肖振 杨, Xiaoting Fu, 晓婷 符, Mingjie Jian, 明杰 简, Jingkun Zhao, 景昆 赵, Hailong Yuan, 海龙 袁, Zhongrui Bai, 仲瑞 白, Mengxin Wang, 梦欣 汪, Yiqiao Dong, 义乔 董, Mingkuan Yang, 明宽 杨, Ziyue Jiang, 子悦 蒋, Qian Liu, 倩 刘, Ganyu Li, 甘雨 李, Haotong Zhang, 昊彤 张

Xiaozhen Yang et al 2026 The Astrophysical Journal Supplement Series 287 .

  • Provider: AAS Journals

Caption: Figure 10.

Comparison of the Ca IIλ8542 line between the templates and the observed solar spectrum at solar parameters. The shaded region and the inset indicate the 1 Å line-core window. The spectral resolving power is ≥300, 000, and solar rotational broadening (﹩v\sin i=1.6\,{\rm{km}}\,{{\rm{s}}}^{-1}﹩) is included.

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