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Old 11-04-2008, 12:21 AM
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Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,863
ETA colours

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!)
Attached Thumbnails
Click for full-size image (t_eta_carene_300.jpg)
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