Substructure and halo population of Double Cluster h and χ Persei Jing Zhong, Li Chen, M. B. N. Kouwenhoven, Lu Li, Zhengyi Shao and Jinliang Hou A&A, 624 (2019) A34 Published online: 03 April 2019 DOI: 10.1051/0004-6361/201834334