NGC 7635

This Bubble Nebula, located in the constellation of Cassiopeia, is the result of the interaction between the stellar wind of a young massive O-type star and the surrounding gas which is pushed back, thus creating its characteristic bubble shape.

The stellar wind is extremely massive and compresses the gas of the surrounding nebula while the very energetic radiation strongly ionizes the latter. The bubble therefore materializes the place where this phenomenon occurs.

The star at the origin of this celestial object is of a particular type since we speak of a "Wolf-Rayet" star. It has the particularity of being very hot and of having entered the end-of-life phase after its main sequence. At this point in its life, it has then finished consuming its basic fuel which is hydrogen. If it is massive enough, it will then start to trigger the helium fusion reactions which, once exhausted, will cause a contraction of the core and an increase in temperature, thus transforming it into a white dwarf.

The image was taken in Hubble palette, that is to say in sho, in order to better highlight the different layers and the structure of the image. Its rather small size makes it a complicated object to photograph. The guiding must be excellent in order to capture as much detail as possible.

Equipment used:
- Skywatcher 80ed Evostar
- ZWO 533mc pro
- ZWO 120mm mini
- EQM-35 Pro
- Asiair plus
- EFW
- EAF
- OAG
- L-Ultimate filter for Ha and OIII layers
- SII filter
- Stacked and Ha/OIII extracted with Siril
- Processed with PixInsight
- Finished with Lightroom