Here is a link to a story about new results showing the evolution of binary stars (which make up half of all stars in the galaxy).
Speaking of binary stars. The video above is a simulation our group did showing an "accretion" disk forming around star immersed in the wind of another, larger star it is orbiting.
The simulation is centered on the smaller orbiting star. The larger wind generating star is not shown.
Top = view from above
Bottom = view from side
Left = zoomed out view (1x size of Earth's orbit round Sun)
Right = zoomed in view (0.2x size of Earth's orbit round Sun)
You can see how the star captures gas from the wind into a dense but thin disk.