Re: AW: [APML] Blue in Packman nebula, real or not?

[ketelsen@as.arizona.edu]

Just adding my two cents - I've used E200 for objective prism spectroscopy
and H-beta and OIII really fall into the "dead zone" between the
sensitivity of the blue and green layers.  That is why planetaries look
blue visually (because H-beta and OIII are near the eye's peak) and look
so red on E-200 shots.  The blue you are getting may be from the bluer
Balmer line emissions...

-Dean


> Hi Joe,
>
> I am quite sure it's real. Take a look at Wolfgang Promper's image (one
> fo the most detailed I have ever seen)
> http://www.astro-pics.com/ngc_281n.htm
>
> There seems to be some H-beta and OIII emission and the E200 picks up at
> least the H-beta part.
>
> Best regards
> Andreas
>


> -----Ursprüngliche Nachricht-----
> Von: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
> Im Auftrag von Joe & Leslie Schaefer
> Gesendet: Mittwoch, 16. Februar 2005 01:53
> An: APML
> Betreff: [APML] Blue in Packman nebula, real or not?
>
>
> Hi
>   I finished processing my images of the Packman nebula and I was
> wondering if anyone knows if this nebula has blue in its core area? The
> image link below is a result of three images (60/90/75 minute
> exposures). Stacked in PW and processed in PS.  Did I over process this
> image or is it real?
> Thanks, Joe
>
> www.starfillednights.com/image_data/ngc281_image_data.htm
>
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