A modern study of HD 166734: a massive supergiant system L. Mahy, Y. Damerdji, E. Gosset, C. Nitschelm, P. Eenens, H. Sana and A. Klotz A&A, 607 (2017) A96 Published online: 21 November 2017 DOI: 10.1051/0004-6361/201730674