Bubbel Nebula NGC 7635 (Jörg Warncke)

Bubbel Nebula NGC 7635

Hi all,

this is my bubble nebula, or more precisely NGC 7635. I took the narrow band frames all in one night early in October with a lot of moonlight around.

This time I employed a barlow lens and extended the focal length to 1500 mm to bring the gas-bubble to center stage. I binned the CCD 2x2 in order to catch more light per final pixel. Also I took a lot more Ha frames than SII and OIII (all at 5nm width). I used the Ha for luminance. The assignment to the RGB channels is mainly HSO, but not purely. I used the OIII for dynamic mixing of Ha and SII in R and G. With 2x2 drizzling I upscaled the resolution again. This way I gathered a lot of light and recovered the resolution. I did not blend RGB stars into the picture, because I felt that it appeals without them as well. But I used the same technique to blend over deconvoluted stars into a starless colour frame of the nebula as I did with RGB stars in my recent picture of Pickerings Triangle. The blending does neither alter the intensity nor the colour of the stars.

Hope you will find something in this picture. I read a bit about the emergence of this bubble from the emission of the giant Typ O star. Interestingly the star is not in the center of the bubble and I wonder how that might have happend. Maybe the bubble is embedded in some kind of drifting environment like a soap-bubble in moving air.

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