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 Post subject: wr140, 2007-12-22
PostPosted: 25. December 2007, 20:46:55 PM 
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Nutzer

Joined: 29. October 2007, 12:10:27 PM
Posts: 12
Hi all,

Last 22nd I managed a spectrum of wr140.
Time of exposure of 2h with LhiresIII-1200l/mm a C9.25 and ST10XME. The issue now is the SNR that I think it is still too low. I wonder for how many time I must to expose in order to achieve the required 150 SNR.
Best regards
Jose


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 Post subject: wr140, 2007-12-22
PostPosted: 25. December 2007, 21:45:49 PM 
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Meister
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Joined: 19. August 2006, 11:45:20 AM
Posts: 2736
Location: 66907 Glan-Münchweiler
Quote:
Hi all,

Last 22nd I managed a spectrum of wr140.
Time of exposure of 2h with LhiresIII-1200l/mm a C9.25 and ST10XME. The
Hallo JOSE,

this spektrum is rather good. You must realize, that my spectra of wr140 are
received with nearly the same equipment , but I used a C14. This is perhaps
the reason for my better SN ratio.....

regards
Berthold


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 Post subject:
PostPosted: 26. December 2007, 17:53:07 PM 
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Meister
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Joined: 31. July 2006, 16:43:32 PM
Posts: 3434
Location: Köln
Hi José!

Your setup is good. However, I believe that Berthold is right and your aperture is too small for the required S/N. Anyway, as soon as possible I will place your results into our project page.

Cherio, Thomas


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