The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features
The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features
The black hole transient V404 Cygni exhibited a bright outburst in June 2015 that was intensively followed over a wide range of wavelengths. Our team obtained high time resolution optical spectroscopy (|$\rm \! \sim \! 90$| s), which included a detailed coverage of the most active phase of the event. …