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| fitz |
12/20/2012 06:36AM (Read 1871 times)
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Status: offline
Registered: 09/30/2005
Posts: 4040
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[color=red:d7f1343e70][Moderator's Note: Posted on behalf of user][/color:d7f1343e70]Hi,I am trying to use addstar, but I don't seem to have any luck.
Using the PSF function determined by daophot.psf (see attached), I use addstar with a photfile resulting in a picture shown in addstar_bad.jpg. The PSF is very crummy. This doesn't make sense, because when I run daophot.seestar, the resulting image is a beautiful PSF.Do you have any idea on what I'm doing wrong?Thank you,
Ori FoxAttachments:addstar_bad.jpg
[img:d7f1343e70]ftp://iraf.noao.edu/pub/addstar_bad.jpg[/img:d7f1343e70]
addstar_bad.jpg: ftp://iraf.noao.edu/pub/addstar_bad.jpg
psf.1.fits: ftp://iraf.noao.edu/pub/psf.1.fits
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| vall |
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12/20/2012 06:36AM
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Status: offline
Registered: 09/28/2006
Posts: 49
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Do you use the correct gain value? It is used to add Poisson noise to the image. Maybe you add too much noise?
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| fitz |
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12/20/2012 06:36AM
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Status: offline
Registered: 09/30/2005
Posts: 4040
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[color=red:c6be1a37f0][Forwarded reply][/color:c6be1a37f0]Thanks vall. Your advice was useful and will come in handy. However, I ultimately tracked the problem down to the following webpage on Spitzer PSFs:http://irsa.ipac.caltech.edu/data/SPITZER/docs/irac/calibrationfiles/psfprf/I never stated that I was working on Spitzer data because I did not realize it mattered.
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