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Re: Coloured spectra - yes it was a bit of a trick question... No one mentioned ( or no one thought to ask...) how the colour was achieved!
Not cheating, but as Al mentioned "synthetic" rendering based on wavelength.
It does, not just for the L-plate guys, sometimes help to visualise in colour. When you see the comparison "graphs" for various colour filters ( LRGB, OIII, Ha, SII etc) most for them are presented "colourised"
I hit a site recently and the spectra illustrated threw me completely ( I know, I know..not a hard thing to do!) by having the Red end on the LHS! Like driving the car via the rear view miror.....
I'm no physicist, but in a "normal" Balmer Hydrogen series, I think the intensity of the Hb is 50% of the Ha...so any diffference in the ratio Hb/Ha shows something else is happening... correct Bernard???
Last edited by Merlin66; 17-05-2009 at 05:15 PM.
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