Spectroscopic time-series analysis of R Canis Majoris H. Lehmann, V. Tsymbal, F. Pertermann, A. Tkachenko, D. E. Mkrtichian and N. A-thano A&A, 615 (2018) A131 Published online: 26 July 2018 DOI: 10.1051/0004-6361/201629914