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- W4230562303 abstract "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 flatfield 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." @default.
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- W4230562303 date "1989-01-01" @default.
- W4230562303 modified "2023-09-29" @default.
- W4230562303 title "CCD Data Taking Modes and Flatfielding Problems" @default.
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- W4230562303 doi "https://doi.org/10.1017/s1539299600008601" @default.
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