FreeLists / az-observing / [AZ-Observing] Re: NGC206 Enhanced Hydrogen Comparison

[Chris Schur <comets133@xxxxxxxxx>]

Hey, that might work.  I will rush home tongigh and
give it a try!  THANKS.

Chris
--- Brian Skiff <bas@xxxxxxxxxx> wrote:

> >>  ...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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> 


Take Care,

Chris
Astro: http://www.schursastrophotography.com
Robotics: http://www.schursastrophotography.com/roboticsmain.html


 
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