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CCD Data Taking Modes and Flatfielding Problems

Published online by Cambridge University Press:  14 August 2015

S. Djorgovski  and
M. Dickinson
S. Djorgovski
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA
M. Dickinson
Affiliation:
Astronomy Department, University of California, Berkeley, CA 94720, USA

Abstract

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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 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.

Type
Joint Commission Meeting
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 645 - 650
Copyright
Copyright © Kluwer 1989

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