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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 9.

﹩{R}_{{\rm{HK}}}^{+}﹩ and ﹩{R}_{8542}^{+}﹩ as functions of T_eff, ﹩\mathrm{log}g﹩, and [Fe/H] for the MaStar and XSL samples, derived using the A1 templates with ﹩{V}_{{\rm{mic}}}={V}_{{\rm{mic}}}^{{\rm{t}}}﹩. The upper two rows show the MaStar sample, and the lower two rows show the XSL sample. The red star marks the Sun. In the T_eff panels, the red curve denotes the 5th percentile relation. High-density regions are shown in yellow, and the median lines are plotted in red. The black horizontal dashed line indicates R⁺ = 0.

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