Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-12T11:46:37.542Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

References

Baluteau, J.-P., and D’Odorico, S. (editors) 1986, Proceedings of the ESO-OHP Workshop on The Optimization of the Use of CCD Detectors in Astronomy, ESO Conference Proceedings No. 25.Google Scholar
Baum, W., Thomsen, B., and Kreidl, T.J. 1981, Proc. S.P.I.E. 290, 24.Google Scholar
Baum, W., Thomsen, B., and Morgan, B. 1986, Astrophys. J. 301, 83.Google Scholar
Djorgovski, S., and Spinrad, H. 1983, in Proceedings of the AAS/OSA Joint Topical Meeting on Information Processing in Astronomy and Optics, June 1983, St. Paul, Minn., p. ThB2-1. AAS/OSA publication.Google Scholar
Djorgovski, S. 1984, in Proceedings of the Workshop on Improvements to Photometry, eds. Borucki, W. and Young, A., p.152. NASA CP-2350.Google Scholar
Griffiths, R. 1985, STScI Newsletter, October 1985, p.5.Google Scholar
Hall, P., and Mackay, C. 1986, M.N.R.A.S. 210, 979.Google Scholar
Janesick, J., Elliot, T., Daud, T., and Campbell, D. 1986, Proc. S.P.I.E. 627, 543.Google Scholar
Janesick, J., Campbell, D., Elliot, T., and Daud, T. 1987, Opt. Eng. 26, 852.Google Scholar
Mackay, C. 1986, Ann. Rev. Astron. Astrophys. 22, 255.Google Scholar
Stetson, P. 1988, DAO preprint; and this volume.Google Scholar
Stetson, P., and Harris, W. 1988, Astron. J. 96, 909.Google Scholar
Tyson, J.A. 1988, Astron. J. 96, 1.Google Scholar
Wright, J.F. 1982, Ph.D. Thesis, University of Cambridge.Google Scholar