The obscured X-ray binaries V404 Cyg, Cyg X-3, V4641 Sgr, and GRS 1915+105

Understand

V404 Cyg, Cyg X-3, V4641 Sgr, and GRS 1915+105 are among the brightest X-ray binaries and display complex behavior in their multiwavelength emission.

• Apart from Cyg X-3, the other three sources have large accretion disks, and there is evidence of a high orbital inclination.
• Therefore, any large scale geometrical change in the accretion disk can cause local obscuration events.
• On the other hand, Cyg X-3 orbits its Wolf-Rayet companion star inside the heavy stellar wind obscuring the X-ray source.