Var C: Long-term photometric and spectral variability of a luminous blue variable in M 33 B. Burggraf, K. Weis, D. J. Bomans, M. Henze, H. Meusinger, O. Sholukhova, A. Zharova, A. Pellerin and A. Becker A&A, 581 (2015) A12 Published online: 25 August 2015 DOI: 10.1051/0004-6361/201323308