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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 12.

Difference between the NLTE and LTE Ca IIλ8542 line-core R indices as a function of [M/H], computed at solar T_eff and ﹩\mathrm{log}g﹩ with high spectral resolution.

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