Peter Jenkin's Hubble techniques followed. Each NB destarred and stretched with GHS, carefully.
There is a discussion of how to deal with the dark side of the histogram here... setting the symetry point and not losing dark data:
GHS Forum DiscussionNarrowband technique used for each channelFrom
GalaxyMap:Sh 2-108 is sometimes called the Gamma Cygni nebula because of the foreground appearance of the F8Iab supergiant (also called
Sadr). In fact this nebula lies far beyond Gamma Cygni in the depths of the
Cygnus X complex of star formation regions.
This nebula is also called DWB 63 and is the location of the radio source W66. According to Avedisova, DWB 63 is ionised by Gamma Cygni, the O8 V class
HD 229202 and the B2 Ib supergiant
HD 193946. Gamma Cygni is now known to be located in the foreground. SIMBAD agrees with the classes for the other two ionising stars.
Avedisova includes Sh 2-108 in star formation region
SFR 78.18+1.82 along with the supernova remnant
DR4, the infrared star cluster
[BDB2003] G077.46+01.76 and numerous other nearby HII regions.
GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>
There are 313 Sh2 objects. All now imaged.
This is my collection:
Sharpless2Wide-Angle Hydrogen Alpha Nikon Image Sh2 79-171Please note there is also a Sharpless2 Group with now more than 2600 examples.
Sharpless2 GroupOther useful links include:
Gary Imm's CollectionGalaxyMap's CollectionThe Sharpless CatalogThe MDW H-alpha Sky SurveyReiner Vogel's detailed observing catalogHope you enjoy these obscure but interesting objects...
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