How to find FWHM?

  • Thread starter bugra
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Hi,
I've been searching on google for minutes but couldn't find out a consistent way so far. I mean, it seems everybody has something to say about it :)

My data consists of pixel values (ADU's). I am writing a script to obtain fwhm of seeing disk.

By definition of the gaussian curve, i should only calculate the standart deviation of these values theni get fwhm=stdev*2.355 .
Am I correct?

Or should i obtain a gaussian fit then i calculate fwhm as its name suggests?

Thanks in advance,
bugra
 

Answers and Replies

  • #2
EnumaElish
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If you do it both ways, and the answers are different, what does that tell you about the fitting algorithm that you used?
 
  • #3
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for multiple sources on the same frame, should fwhm be same?
 
  • #4
chemisttree
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I would think the actual value of FWHM is less important than the rate of change near perfect focus.
 

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