Analytical Flatfield Corrections on VATT Data

Details Analytical Flatfield Corrections on VATT Data Analytical Flatfield Corrections on VATT Data

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..364..563b&link_type=abstract

The Future of Photometric, Spectrophotometric and Polarimetric Standardization, ASP Conference Series, Vol. 364, Proceedings of

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We describe our methods to correct the initial flatfields by removing detected systematic dependency of the stellar magnitudes on their location in the CCD frames. Assuming flatfields are made with exposures on a unit input light source and that no added scattered light arrives in the focal plane, then such flatfields should be fine for calibrating the exposures on star fields. But at VATT (and probably most telescopes) the two assumptions of unit input and of absence of scattered light, are not strictly valid. And so the photometry is compromised unless correct flatfields are found.

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