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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 1.

Distributions of Teff, ﹩\mathrm{log}g﹩, [Fe/H], and [α/Fe] for LAMOST DR9, MaStar, and XSL. The blue dashed line marks the median [Fe/H]cal of MaStar. Due to the small number of stars in XSL, its bin sizes are twice those of LAMOST and MaStar.

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