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CCD Data Taking Modes and Flatfielding Problems

Djorgovski, S. and Dickinson, M. (1989) CCD Data Taking Modes and Flatfielding Problems. In: Highlights of Astronomy. International Astronomical Union. No.8. Springer , Dordrecht, pp. 645-650. ISBN 978-0-7923-0281-0.

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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.

Item Type:Book Section
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Djorgovski, S.0000-0002-0603-3087
Additional Information:© 1989 International Astronomical Union.
Subject Keywords:Interference Fringe; Poissonian Noise; Flat Field; Faint Star; Faint Object
Series Name:International Astronomical Union
Issue or Number:8
Record Number:CaltechAUTHORS:20190730-105232292
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97517
Deposited By: Tony Diaz
Deposited On:01 Aug 2019 20:37
Last Modified:16 Nov 2021 17:32

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