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| nakisa |
11/15/2010 10:45PM (Read 1214 times)
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Status: offline
Registered: 10/02/2009
Posts: 10
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Hi, I have two questions about PHOT.
First , I am doing photometry on some stars in M31. PHOT gave me -23 . I don't know where this minus comes from!
second, how can I get error bar on the magnitude value with PHOT?
Best,Nakisa
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| fitz |
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11/15/2010 10:45PM
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Status: offline
Registered: 09/30/2005
Posts: 4040
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There's not really enough information in your post to comment specifically. The magnitude is computed using a 'zero point' value from the 'photpars.zmag' parameter. This is normally set to 25.0, but if you reset it to zero it might explain your large value.Otherwise, errors are reported as the 'merr' column in the output table, specifically this is derived as[code:1:16d9b4c7f4]merr = 1.0857 * error / flux[/code:1:16d9b4c7f4]See the help page for details.
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negative magnitude in PHOT
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