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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.23 no.1-2 (1996), pp. 051-057
Variability of the HeII Pickering Lines in the Spectrum of EZ CMa During the Period 1990-1993
M.M. Ivanov1, L.N. Georgiev1, T.S. Valchev2
1Department of Astronomy, Faculty of Physics, University of Sofia, 5 James Bourchier Blvd., BG-1164 Sofia, Bulgaria
2Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., BG-1784 Sofia, Bulgaria
go back1Department of Astronomy, Faculty of Physics, University of Sofia, 5 James Bourchier Blvd., BG-1164 Sofia, Bulgaria
2Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., BG-1784 Sofia, Bulgaria
Abstract. Spectral observations of the uncommon Wolf-Rayet star EZ CMa (WR6) during the period 1990-1993 are presented. The analysis of the variability of the Hell Pickering lines revealed the existence of preferential Doppler shifts for the appearance of the profile deformations. The investigation confirmed the reported by Ivanov et al. [9] presence of changes of the red wings probably due to variable electron scattering. The results are discussed in the light of the peculiar single star and binary (WR + compact companion) hypotheses.