Photometric Observations Using Orthogonal Transfer CCDs

Details Photometric Observations Using Orthogonal Transfer CCDs Photometric Observations Using Orthogonal Transfer CCDs

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasp..115.1340h&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 115, Issue 813, pp. 1340-1350.

Astronomy and Astrophysics

Astronomy

30

Instrumentation: Photometers

Scientific paper

Orthogonal transfer CCDs (OTCCDs) were developed to compensate for real-time image motion, essentially providing tip/tilt corrections without additional optics or moving parts. Because of the complex gate structures of OTCCDs, their ability to provide high-precision photometric observations and their use as high-speed photometers were unclear. We detail new observations obtained with the OPTIC camera at the University of Hawaii's 2.2 m telescope on Mauna Kea that explore both of these areas. We find that OTCCDs provide equally good results in terms of typical time-series differential photometry (compared with typical CCDs) and that their high-speed photometric application is superb. Using point-spread function-shaping techniques, we obtained time-series photometric observations with precisions of <~660 μmag per 180 s integration. Extending this technique to very bright stars, the potential to reach differential precisions near 10-5 per exposure is investigated.

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