A CCD antiblooming technique for use in photometry

Statistics – Methodology

Scientific paper

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Astronomical Photometry, Charge Coupled Devices, Image Processing, Performance Tests, Bl Lacertae Objects, Calibrating, Methodology, Noise Reduction

Scientific paper

A new antiblooming technique was used to collect images for a BL Lac monitoring project. The antiblooming was accomplished by clocking two of the collection phases (in a three-phase chip) back and forth during the integration of an image. Calibrations were done using VRI standard stars to insure that the technique did not affect normal photon collection and photometric data. New sources of noise were identified which must be subtracted from the processed imaging. In contrast, the technique reduced dark current noise, which is of benefit with a thermoelectric-cooled camera. The technique eliminated blooming across the stars of interest, while preserving photon-collection efficiency. It also reduced the total noise of the exposures.

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