UVIS L-Flats and Geometric Distortion

Details UVIS L-Flats and Geometric Distortion UVIS L-Flats and Geometric Distortion

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11911s&link_type=abstract

HST Proposal ID #11911. Cycle 17

Physics

Scientific paper

Multiple pointing observations of the globular cluster Omega Centauri {NGC 5139} will be used to measure the filter-dependent low frequency flat field {L-flat} corrections and stability for a key set of 10 broadband filters used by GO programs. The selected filters are F225W, F275W, F336W, F390W, F438W, F555W, F606W, F775W, F814W and F850LP. By measuring relative changes in brightness of a star over different portions of the detector, we will determine local variations in the UVIS detector response. The broad wavelength range covered by these observations will allow us to derive the L-flat correction for the remaining wide, medium and narrow-band UVIS filters. The same data will also be used to determin and correct the geometric distotrion that affects UVIS data. The broad wavelength range covered by these observations will allow us to measure the geometric distortion dependence with wavelength and filters and to provide the most appropriate correction over the entire wavelength range provided by UVIS.;

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