NGC 7635: A bubble between clouds

Image Description and Details : My last image is a Bubble nebula (NGC 7635) with SHO narrowband channel and added RGB stars.
It is an emission nebula located in the constellation of Cassiopeia. The central bubble is one of three layers of hot gas surrounding the star SAO 20575, a very hot O6.5-class star. Curiously, this star (which is the one that heats the gas so that it emits light), due to its rapid movement, is not in the geometric center of the bubble. It is seen in the lower left area of the center of the bubble. It is a very young star (about 4 million years old...) and is expected to explode as a supernova in about 15 million years (more or less a million...). Interestingly, this nebula is located in a region where another supernova has already exploded.
It's great a lot of signal of SII, and aprecciate a large structures between bubble.

Tech data:
Halpha 25 of 900" astrodon 5nm
OIII 30 of 900" astrodon 5nm
SII 25 of 900" astrodon 5nm
RGB 25 each channel 120" astdodon
Telescope: Skywatcher Esprit 150
CCD: Atik 460ex
Mount: Paramount ME

Copyright: Carlos Uriarte Castilllo