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Gerhard Bachmayer | all galleries >> AstroPhotos >> Astrophotos 2003 - 2007 > The Crescent Nebula (NGC6888) in Cygnus
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The Crescent Nebula (NGC6888) in Cygnus
12-AUG-2005

The Crescent Nebula (NGC6888) in Cygnus

The nebula is the glowing remain of the outer hydrogen shell, shed off from a red super-giant sun and exposing its helium burning center, which is called a Wolf-Rayet star. Strong stellar winds from the star compressed and stimulated the surrounding gas and dust, and the strong ultra violett radiation excited it to glow.
In a few million years the star will end its life in a super nova.

Canon EOS 20D
Modified Canon 20D mounted on a Vixen R200SSDG(8"/F4)+ Televue Paracorr. 20x300sec H-alpha ( with Astronomik H-alpha filter 13nm)+ 20x300sec RGB ( with IDAS-LPS). Calibration and stacking, averaging, color balancing, sharpening in Images Plus and Photoshop CS2.
The H-alpha exposure is used as the red channel of the RGB image to boost contrast. full exif


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