Abstract
We briefly review some problems in the flatfielding of CCD images, in the context of three data-taking modes: stare, short scan, and drift scan. The principal sources of flatfielding imperfections are: (1) mismatch in the spectra of the astronomical sources of interest and the flatfleld illumination; (2) a variety of low-level additive errors; and (3) nonlinearities of the CCD response. Residual flatfielding errors are probably the limiting factor in high-precision astronomical photometry. Flatfielding accuracies of the order of 1 – 2% per pixel are commonly achieved; with some effort, accuracies of ~ 0.1% can be reached; higher accuracies require a substantial effort, or improvements in the quality of CCD chips. In general, scanning data taking modes outperform the “standard” stare mode.
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© 1989 International Astronomical Union
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Djorgovski, S., Dickinson, M. (1989). CCD Data Taking Modes and Flatfielding Problems. In: McNally, D. (eds) Highlights of Astronomy. International Astronomical Union / Union Astronomique Internationale, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0977-9_115
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DOI: https://doi.org/10.1007/978-94-009-0977-9_115
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