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Old 21-09-2013, 09:14 PM
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skysurfer
Dark sky rules !

skysurfer is offline
 
Join Date: Dec 2011
Location: 33S 150E (AU holiday)
Posts: 1,181
The truth about star colors

In many publications the spectral classes are colored as follows:

O - blue
B - bluish white
A - white
F - yellowish white
G - yellow
K - orange
M - red

With my experience in many cases this is NOT true. Look at Canopus it is white with a bluish tinge, particularly when looking with a telescope or binoculars and then is it visible with many other brighter F stars like Procyon or Polaris.
Same with the 'yellow' G-stars Capella or Alpha Centauri, they look ... white.
So called 'red' stars which are bright (Antares, Betelgeuse) look like a remote halogen bulb or warmwhite LED lamp, which has the same (color) temperature.
Only in daylight, Alpha Centauri and Capella look yellowish in the telescope but that is the contrast to the blue sky.
A 5800K color temp CFL or metal halide lamp (same color temp as G stars) looks white.

What are your ideas ?
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