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Paper: The Orbital Period of the B[e]/X-ray Binary CI Cam/XTE J0421+560
Volume: 355, Stars With the B[e] Phenomenon
Page: 305
Authors: Barsukova, E.A.; Borisov, N.V.; Burenkov, A.N.; Klochkova, V.G.; Goranskij, V.P.; Metlova, N.V.
Abstract: Our seven-year long photometric and spectroscopic monitoring of CI Cam reveals the low amplitude light variation with a period of 19.41 ± 0.02 day and strong Doppler shifts in the He II 4686Å emission line, phased with this period. The source of this emission moves on an elliptical (e=0.62) orbit around a massive (M ≥ 12MSolar) B4 III–V[e] star. It is very likely that the fast moving companion is a white dwarf surrounded by an accretion disk.
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