Charge-Transfer Efficiency of WFPC2

Details Charge-Transfer Efficiency of WFPC2 Charge-Transfer Efficiency of WFPC2

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasp..111.1559w&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 766, pp. 1559-1576.

Astronomy and Astrophysics

Astronomy

103

Instrumentation: Detectors, Methods: Data Analysis, Methods: Statistical, Techniques: Image Processing, Techniques: Photometric

Scientific paper

Observations of ω Centauri have been used to characterize the charge-transfer efficiency (CTE) of the Wide Field and Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope. A set of formulae has been developed to correct aperture photometry for CTE loss with dependencies on the X- and Y-positions, the background counts, the brightness of the star, and the time of the observation. The observations indicate that for very faint stars on a very faint background, the CTE loss from the top to the bottom of a chip has increased from about 3% shortly after the cooldown of WFPC2 (1994 April 23) to roughly 40% in 1999 February. In general, typical WFPC2 exposures are much longer than these short-calibration images, resulting in higher background which significantly reduces the CTE loss and minimizes the CTE problem for most science exposures.

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