An Ha-enhanced LRGB Image of the Flaming Star Nebula’s Central Regions

Photographer
heaton
Email
halhjr@gmail.com
Location of photo
Burke-Gaffney Observatory, St. Mary’s University, Halifax, NS
Date/Time of photo
Several clear nights from 3 October 2016 to 12 November 2017
Equipment
Robotic 0.61-m Planewave CDK24 reflector (f/6.5) equipped with an Apogee CG-16M CCD camera and Astrodon broadband (LRGB) and narrowband (H-alpha) filters. The camera output was binned 2x2 to provide a 2048 x 2048 px image plane with an uncropped field-of-view of 31.9 x 31.9 arcmins, and a resolution of 0.94-arcsecs/pixel.
Description
The Flaming Star Nebula (IC 405) in Auriga glows primarily in the light of atomic hydrogen excited by the radiation and shocks produced by the massive blue dwarf star AE Aur as it rapidly moves through the interstellar cloud of gas and dust comprising the nebula. Lying more than 1700 light years from Earth, the wispy blue emission curling away from this 23 solar mass star resembles smoke, giving rise to the sensation that it is “on fire.” In spite of appearances, AE Aur is a “runaway star” that did not form in its current location; it was ejected from near where the Trapezium Cluster now appears in Orion’s sword during a collision between two binary star systems nearly two million years ago. The raw data used to prepare this picture were collected as unguided 1-min sub-exposures, which were integrated using CCDStack (CCDWare) to produce mean grey-scale images of 1.3, 1.1, 1.1, 1.8 and 2.9-hrs duration in the LRGB and H-alpha bands, respectively. The final image was produced using Photoshop (Adobe) by initially blending the mean H-alpha image with both the mean Luminance and Red images to enhance their detail, high-pass filtering those results to enhance their contrast, and combining them with the mean G and B images. Subsequently, the image was cropped, the color-balance among the channels was adjusted, the background noise-level was reduced, and the stellar profile shapes were corrected to reduce distortions introduced by the lack of guiding.
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