An 18.9 min blue large-amplitude pulsator crossing the ‘Hertzsprung gap’ of hot subdwarfs

Jie Lin, Chengyuan Wu, Xiaofeng Wang, Péter Németh, Heran Xiong, Tao Wu, A. V. Filippenko, Yongzhi Cai, Thomas G. Brink, Shengyu Yan, Xiangyun Zeng, Yangping Luo, Danfeng Xiang, Jujia Zhang, WeiKang Zheng, Yi Yang, Jun Mo, Gaobo Xi, Jicheng Zhang, Abdusamatjan Iskandar, Ali Esamdin, Xiaojun Jiang, Hanna Sai, Zixuan Wei, Liyang Chen, Fangzhou Guo, Zhihao Chen, Wenxiong Li, Weili Lin, Han Lin, Xinghan Zhang