Evidence of a non-conservative mass transfer in the ultra-compact X-ray source XB 1916-053 R. Iaria, A. Sanna, T. Di Salvo, A. F. Gambino, S. M. Mazzola, A. Riggio, A. Marino and L. Burderi A&A, 646 (2021) A120 Published online: 17 February 2021 DOI: 10.1051/0004-6361/202039225