Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004stis.rept....3m&link_type=abstract
Instrument Science Report STIS 2004-03, 16 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph
Scientific paper
Using calibration data obtained during 1997-2002, a study of the full-field sensitivity of the STIS CCD in clear (50CCD) imaging mode is carried out. Throughputs measured for several stars in deep exposures of a sparse field in the globular cluster ω Cen (= NGC 5139) show a negligible temporal variation of the order of 1% in sensitivity over the past five years. This does not depend on the brightness of the stars considered here, nor on their color (within the range covered, 0.5 < B - V < 0.9). Also, no significant changes in the CCD throughput were found after the switch to Side-2 electronics in July 2001. We do find a dependence of the count rate on exposure time at recent epochs which increases for fainter stars. The magnitude of this effect is consistent with being caused by Charge Transfer Inefficiency (CTI) of the STIS CCD. Finally, the variation of throughput across the field of view of the CCD is studied and found to be a < 3σ effect.
Davies James
Goudfrooij Paul
Mobasher Bahram
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