Optical studies of V404 Cyg, the X-ray transient GS2023 + 338. II - High-resolution H-alpha spectroscopy in quiescence
Results of high-resolution optical spectroscopy of V404 Cyg (the optical counterpart of the X-ray transient GS2023 + 338), conducted 13 months after the May 1989 outburst are presented. The double-peaked H-alpha line exhibits a strong S-wave modulation from which a periodicity of 5.7 hr is deduced. The level of the continuum is also modulated on
Casares, J. et al.
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1992