Expanding shells around young clusters – S 171/Be 59 G. F. Gahm, M. J. C. Wilhelm, C. M. Persson, A. A. Djupvik and S. F. Portegies Zwart A&A, 663 (2022) A111 Published online: 21 July 2022 DOI: 10.1051/0004-6361/202142927