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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 5.

Atmospheric-parameter comparison for cross-matched samples. LAMOST parameters are shown on the x-axis, while the corresponding MaStar and APOGEE parameters are shown on the y-axis. Gray: LAMOST–MaStar cross-match. Large squares: LAMOST–MaStar–APOGEE triple match, with APOGEE parameters in red and MaStar median parameters in black. Blue points in [Fe/H] show MaStar [Fe/H]cal. Solid black line: y = x; dashed line: estimated relation between MaStar and LAMOST parameters.

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