Examining the nature of the ultraluminous X-ray source Holmberg II X-1 F. Barra, C. Pinto, M. Middleton, T. Di Salvo, D. J. Walton, A. Gúrpide and T. P. Roberts A&A, 682 (2024) A94 Published online: 06 February 2024 DOI: 10.1051/0004-6361/202348471