Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11887m&link_type=abstract
HST Proposal ID #11887. Cycle 17
Physics
Scientific paper
This program will verify that the low frequency flat fielding, the photometry, and the geometric distortion are stable in time and across the field of view of the CCD arrays. A moderately crowded stellar field in the cluster 47 Tuc is observed with the HRC {at the cluster core} and WFC {6 arcmin West of the cluster core} using the full suite of broad and narrow band imaging filters. The positions and magnitudes of objects will be used to monitor local and large scale variations in the plate scale and the sensitivity of the detectors and to derive an independent measure of the detector CTE. The UV sensitivity for the SBC and HRC will be addressed in the UV contamination monitor program {11886, PI=Smith}. One additional orbit will be obtained at the beginning of the cycle will allow a verification of the CCD gain ratios for WFC using gain 2.0, 1.4, 1.0, 0.5 and for HRC using gain 4.0 and 2.0. In addition, one subarray exposure with the WFC will allow a verification that photometry obtained in full-frame and in sub-array modes are repeatable to better than 1%. This test is important for the ACS Photometric Cross-Calibration program {11889, PI=Bohlin} which uses sub-array exposures.;
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