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Sunday, October 26, 2014

Cederblad 214, the second light photo for my new setup

The second light for the new setup, Cederblad 214 in constellation Cepheus. Once again, I was impressed about the needed exposure time. For a good S/N only 2h of exposures was needed for H-alpha. A good image scale (~1 arcsecond/pixel) and a narrow pass band is a good combination.

Cederblad 214 (Ced 214), NGC 7822, Sharpless 171
Click for a large image

Image is in mapped colors from emission of the ionized elements, Red=Sulfur, Green=Hydrogen and the Blue =Oxygen.

A closeup
Click for a large image

Pillar like formations of Cederblad 214


Towering pillars of cold gas and dark dust adorn the center star forming region of Sharpless 171. An open cluster of stars is forming there from the gas in cold molecular clouds. As energetic light emitted by young massive stars boils away the opaque dust, the region fragments and picturesque pillars of the remnant gas and dust form and slowly evaporate. The energetic light also illuminates the surrounding hydrogen gas, causing it to glow as an emission nebula. Pictured above is the active central region of the Sharpless 171 greater emission nebula. Sharpless 171 incorporates NGC 7822 and the active region Cederblad 214, much of which is imaged above. The area above spans about 20 light years, lies about 3,000 light years away, and can be seen with a telescope toward the northern constellation of the King of Ethiopia (Cepheus).

A study about shapes in the nebula

All pillar like formations are pointing to a source of ionization, the open cluster NGC 7822. There are some more dense areas in a gas, able to resist the radiation pressure from young star cluster. Those dense areas, at a tip of the pillars, are also potential places for the formations of the new stars.

An older wide field image of the area
"The Cosmic Question Mark"

The area of interest is pointed out with a white rectangle.
Info about this older image can be seen HERE

Technical details

Processing work flow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f7 with 0,7 focal reducer for Edge HD 1100 telescope

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar
Astrodon filter, 5nm H-aplha
Astrodon filter, 3nm O-III
Astrodon filter, 3nm S-II

Exposure times
H-alpha 6 x 1200s = 2h
O-III 3 x 600s = 1h
S-II 3x 600s = 1h

A single un cropped, calibrated and stretched 20 min. H-alpha frame

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