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| Gaba_p |
02/23/2012 01:34PM (Read 1455 times)
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Status: offline
Registered: 10/10/2008
Posts: 104
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Hi,my question is fairly simple I think. When the photometry process is done, I'm presented with a file containing several columns named:# 1 object id
# 2 x
# 3 y
# 4 V
# 5 error(V)
# 6 BV
# 7 error(BV)
# 8 UB
# 9 error(U 
# 10 VI
# 11 error(VI)The question is: are these errors [b:b70ffc3a4d]standard deviations ([i:b70ffc3a4d]sigma[/i:b70ffc3a4d])[/b:b70ffc3a4d]? Or should I assume these errors in fact represent the [b:b70ffc3a4d]whole[/b:b70ffc3a4d] range where the actual parameter value (be it V, BV, UB or VI) can exist (ie: ~[i:b70ffc3a4d]3*sigma[/i:b70ffc3a4d])?I hope I'm being clear.I will really appreciate some help on this issue.Cheers!
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| fitz |
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02/23/2012 01:34PM
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Status: offline
Registered: 09/30/2005
Posts: 4040
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Looking at the code for EVALFIT/INVERTFIT, it appears to be the standard deviation.
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| Gaba_p |
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02/23/2012 01:34PM
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Status: offline
Registered: 10/10/2008
Posts: 104
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Thanks fitz.Shouldn't such a sensitive parameter be more clearly described in the manuals/help files? I think it's quite an issue when even you, one of the people with more knowledge about IRAF, can't be totally sure if that number actually represents the standard deviation or some other value...Cheers,
Gabriel
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Simple photometry errors question
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