Reverse mass transfer and rejuvenation in the massive contact system Shitao Qi, Hanfeng Song, Georges Meynet, Andre Maeder, Sylvia Ekström, Luca Sciarini, Ruiyu Zhang, Ying Qin and Qiong Zhan A&A, 699 (2025) A178 Published online: 07 July 2025 DOI: 10.1051/0004-6361/202554603