WR134 is a Wolf-Rayet star in Cygnus. It has stripped of part of its shell that is driven away by the massive radiation of the star. The shock front forms a bubble that glows in Ha and OIII light.
I had one short night for Ha and not enough Oiii and another one for more OIII and RGB for the stars. In total the image was built from 6.7 hours of light.
Data on Astrobin:
In the processing I concentrated on the bubble and left the well structurated Ha background stay back. By the way, the OIII bubble does 360° and the Ha makes only 120° of the bubble circle at least in my case. You can see that in the 6-10 o' clock region of the bubble where the ha glooms through from behind.
Hope you like it!
C&C welcome like as always.