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Old 11-04-2008, 07:19 AM
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Zuts is offline
Join Date: Mar 2007
Location: sydney
Posts: 1,464
Originally Posted by Merlin66 View Post
Don't be misled by some of the "artistic" colour rendering on astro shots.
We're getting brainwashed to look only for the "Oh Ahh".
The attached spectrum of ETA shows two large peaks, which are well above anything else.... these are Ha (6563)and Hb (4861), the Ha is red,red,red, and the Hb blue.
Very little if any OIII ( 4959/5007) So based on this spectrum, it would be 4 parts red to one part blue.
What I'm trying to get at is the end result will always be biased based on "perceptions" ( and the responce of the CCD!)
Hi Ken,

That is a very interesting observation. I would find it very interesting to see a similar spectra for the Tarantula nebula.

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