Quote:
Originally Posted by RickS
That sounds interesting. Please pass it on if you happen to come across it again, Clive.
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Sure.
I'm scratching my head trying to remember where I came accross it.
From memory, my google search at the time was specific to metalicity of local group dwarf irregular galaxies inferred from Halpha to Oiii ratio.
The (obvious) caution probably needs to be added that broadband channels include the emission lines, so it is not as straightforward as a simple subtraction.
Anyway, I'll keep digging.
regards,
c