Up: Limitations, Extra Observations, and the First Stages of Analysis
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Further analysis of clean CCD frames depends on the purpose of
observation; for the most part it can be carried out with standard
techniques wrapped up in user-friendly software packages. There remain
some aspects of analysis peculiar to CCDs which are worth mentioning here
without full discussion:
- In broad-band photometry, there is a difficulty in establishing a
U-band calibration which is consistent with standard scales. This
difficulty concerns the form of the cutoff to short wavelengths.
- For the RCA and GEC chips at f/15 on the JKT the corresponding
scales are 0.41 and 0.30 arcsec. In conditions of good seeing, undersampling
is thus severe. This may not affect the analysis of single observations.
However, intercomparison of observations will usually require resampling,
rebinning, or convolution/deconvolution, and these processes may
be heavily constrained by the sampling problem.