MY Camelopardalis, a very massive merger progenitor J. Lorenzo, I. Negueruela, A. K. F. Val Baker, M. García, S. Simón-Díaz, P. Pastor and M. Méndez Majuelos A&A, 572 (2014) A110 Published online: 04 December 2014 DOI: 10.1051/0004-6361/201424345