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Tuesday, March 15, 2011
PuWe1, a Planetary Nebula in Lynx
A bicolor composition from emission of ionized elements. H-alpha = Red, O-III = Green and 85%O-III+15%H-a = Blue. This composition is very close to a visual spectrum. Star colors are mixed with a same method.
AN OUTER HALO!
After new sets of exposures, it really starts to look, that there is an outer halo in this Planetary Nebula!
I haven't seen it mentioned anywhere nor imaged before.
PuWe1 seems to have a same kind of structure, than much brighter M27: http://astroanarchy.blogspot.com/2011/02/m27-dumbbell-nebula-reprocessed.html
This is an extreme dim nebula but after processing the data carefully, the emission of ionized Oxygen, O-III, seems to have much large diameter, than a circular H-a area at center. There is an extended area of H-a outside of the main structure, it seems to be stronger at Right side of the Nebula.
M27 and PuWe at the same scale.
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack.
Levels, curves and color combine in PS CS3.
Tokina AT-X 300mm f2.8 @ f2.8
Platform and guiding, Meade LX200 GPS 12" @ f5
Image Scale, 3,79 arc seconds/pixel
Baader H-alpha 7nm 12x1200s, binned 1x1
and 16x900s, binned 2x2
Baader O-III 8,5nm 14x600s, binned 3x3