Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9018d&link_type=abstract
HST Proposal ID #9018
Computer Science
Hst Proposal Id #9018
Scientific paper
The stability and uniformity of the low-frequency flat fields {L-flat} of the WFC detector will be assessed by using multiple pointing observations of the globular clusters 47 Tucanae {NGC104}, thus imaging moderately dense stellar fields. By placing the same star over different portions of the detectors and measuring relative changes in its brightness it will be possible to determine local variations in the response of the detectors. Based on previous experience with STIS, it is deemed that a total of nine different pointings will suffice to provide adequate characterisation of the flat field stability in any given band. For each filter to be tested, the baseline consists of 9 pointings with steps of 14% of the FOV in a diagonal cross pattern {thence the steps are of about 10% of the FOV in both the X and Y direction}. During SMOV, the complement of filters to be tested is limited to the following: for the WFC, three SDSS filters {F435W, F775W, F850LP} and the F555W, F606W and F814W filters. In order to provide complementary data for the geometric distortion programmes {9027 and 9028}, and also to check that the distortion is not chromatic, three additional exposures will be taken with each of F775W, F220W and F125LP with a very small { 10 pixel} offset from the centre {see proposals ACS27 and ACS28}.
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