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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 A1.

Discontinuities in the GSL and BT-Settl libraries. The left panel shows the GSL results, with the discontinuity occurring at Teff ≈ 5100 K; RHK is shifted upward for visual clarity, and R8542 is shown in the lower part of the same panel. The right panel shows RHα from BT-Settl, with the discontinuity occurring at Teff ≈ 5900 K. High-density regions are shown in yellow.

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