Since my processing technique gets better and weather doesn't give any support, I have reprocessed some older images. There is now star colors added and other processing is tweaked too.
Sh2-221, 216, 217 and 219
in constellation Auriga
Image is in HST-palette, (HST=Hubble Space Telescope)
from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.
Note. Looks like that there is an outer shell in the Sh2-216 planetary nebula at a right hand side of the image
It's visible only in ionized sulfur channel, I never seen it before in any image. It can be seen as a red color in HST-palette image above. It's most visible at twelve and six a clock position above and belove the main body of the nebula.
In this rare image, two Stars has ended they lifes. Right one is an old, very dim and large, Planetary Nebula and the Left one is an extremely dim Supernova remnant. The North is Up and the field of view is about 5,5 degrees horizontal.
I have seen very few images of eather of them, and never seen them as a three colour narrow band.
Objects in the image are from the Sharples Catalog. Left one is Sh2-221 and the Right one Sh2-216.
There are other smaler Sh2-objects too in a same field, Sh2-217 and Sh2-219, they are all located in constellation Auriga.
Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.
Image is shot with a QHY9, Baader narrowband filter set and the Canon EF 200mm F1.8 lens @ f1.8.
Original versions from March 2009, with technical details:
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