CCD Data Taking Modes and Flatfielding Problems

  • S. Djorgovski
  • M. Dickinson
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUH, volume 8)

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.

Keywords

Interference Fringe Poissonian Noise Flat Field Faint Star Faint Object 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© International Astronomical Union 1989

Authors and Affiliations

  • S. Djorgovski
    • 1
  • M. Dickinson
    • 2
  1. 1.California Institute of TechnologyPasadenaUSA
  2. 2.Astronomy DepartmentUniversity of CaliforniaBerkeleyUSA

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