Orbital and quasi-periodic optical variations in the black hole X-ray binary V404 CYG
We present 2 weeks of CCD photometry of V404 Cyg, the optical counterpart of the soft X-ray transient (SXT) GS 2023+338, taken from La Palma in 1992 July. The R-band light curve shows a clear 0.3-mag ellipsoidal modulation on the estabished 6.5-d orbital period, but with substantial (up to 0.3 mag) superposed variations that occur during each night
Pavlenko, E. P. et al.
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