Magnetic activity of RS CVn stars based on TESS and LAMOST surveys Lulu Xu, Liyun Zhang, Yinpeng Wang, Tianhao Su, Xianming L. Han, Prabhakar Misra, Zhongzhong Zhu and Qingfeng Pi A&A, 699 (2025) A322 Published online: 16 July 2025 DOI: 10.1051/0004-6361/202451962