Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9019b&link_type=abstract
HST Proposal ID #9019
Computer Science
Hst Proposal Id #9019
Scientific paper
The stability and uniformity of the low-frequency flat fields {L-flat} of all ACS detectors will be assessed by using multiple pointing observations of the globular clusters NGC104, NGC6681 - 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 20% of the FOV in a diagonal cross pattern. During SMOV, the complement of filters to be tested is limited to the following: for the HRC, the SDSS filter set {F475W, F625W, F775W, F850LP} and the F555W, F606W and F814W filters, with the further addition of F220W and F330W. 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 with a very small { 10 pixel} offset from the centre {see proposals 9027 and 9028}. Execution of this programme must await completion of programme 9011 {ACS to FGS alignment} and the ensuing PDB update.
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