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Very peculiar wind from BD+53°2790, the optical counterpart to 4U 2206+54

Negueruela, I.; Ribó, M.; Blay, P.

BD+53°2790, an O9.5V star, is the optical counterpart to the HMXRB 4U 2206+54. This system was classified initially as a BeX, but observational evidence soon stressed the need to revise this classification. The permanent asymmetry in the Hα line profiles (in contrast with the cyclic variations shown by Be stars), the variations in the profile of t…