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[AZ-Observing] Re: NGC206 Enhanced Hydrogen Comparison
- From: Brian Skiff <bas@xxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Tue, 12 Dec 2006 13:08:57 -0700 (MST)
>> ...I would need of course a red filter
>> that excludes hydrogen alpha.
Not true. See any of the large number of papers in the
professional literature that obtain H-alpha images just in the
manner I described. The problem is that the H-alpha filter is
not so narrow that it excludes the red continuum. So you subtract
out of the H-alpha image some fraction of the flux using the
broadband red image.
\Brian
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