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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 15.

Effects of different radiative transfer codes, model atmospheres, and line lists on the Ca IIλ8542 profile under solar parameters. The black curve shows the observed solar spectrum. The reference iSpec configuration adopts SPECTRUM, MARCS, and VALD, and only one component is varied at a time. The solar abundances are adopted from Grevesse2007.

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