David's Astronomy Pages Notes - CCD Session 2 (2001-09-25)

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FWHM Analysis of Double-Double Image

An 8 second exposure of Double-Double in Lyra (#2014) was analysed. It showed a FWHM for the entire image of around 4 arc sec. The binary components of each of the 2 main stars could not be resolved with this seeing, however their presence can be detected from the abnormally large FWHM of around 8 arc secs for both of these stars.

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Deconvolution Analysis of Double-Double Image

Original image of an 8 second exposure of Double-Double in Lyra (#2014) showed no indication of the binary components of each of the 2 main stars due to poor seeing (FWHM of around 4 arc secs).  Their presence can be detected by abnormally large FWHM values for the 2 main stars of around 8 arc secs (see above) and by deconvolution :

2001-09-25 Original Image (#2014, part)		Richardson-Lucy Processing Sigma 3.6, Iterations 25,  Kernal Size 11	Background and range adjusted (extreme)

A series of Richardson-Lucy processing runs were made with different parameters before deciding that the right hand image above gave the most information about the Double-Double.

Richardson-Lucy Processing - various parameters 1 (LOCAL FILE)
Richardson-Lucy Processing - various parameters 2 (LOCAL FILE)

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