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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 6.

Variations of RHK (left panel) and R8542 (right panel) with Teff, ﹩\mathrm{log}g﹩, [Fe/H], and [α/Fe] for the A1 templates at LAMOST resolution. Different line styles denote different ﹩\mathrm{log}g﹩ values, colors denote different [Fe/H] values, and marker types denote different [α/Fe] values. The residuals show ΔR between two [Fe/H] values at ﹩\mathrm{log}g=4.4﹩ and [α/Fe]=0.

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