A test of the STIS CCD flatfielding accuracy on small scales

Details A test of the STIS CCD flatfielding accuracy on small scales A test of the STIS CCD flatfielding accuracy on small scales

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hstc.work...90f&link_type=abstract

The 1997 HST Calibration Workshop with a New Generation of Instruments, p. 90

Physics

Calibrating, Charge Coupled Devices, Hubble Space Telescope, Stellar Spectrophotometry, Imaging Spectrometers, Accuracy, Shadows, Dust, Data Reduction, Reliability

Scientific paper

This is a preliminary report on the reliability of Space Telescope Imaging Spectrograph (STIS) Charged Coupled Devices (CCD) flatfielding on small scales. The STIS CCD flatfield images are constructed from internal calibration lamp observations. As the calibration subsystem does not have the same focal ratio as the input path from the sky, shadows from dust particles on the detector face plate may not be corrected perfectly by the internal calibration. To test the repeatability of stellar photometry in the presence of these flatfield variations, observations of the core of the globular cluster 47 Tuc were made with the telescope offset repeatedly by small amounts between exposures. Preliminary results indicate that photometry is repeatable to better than 1%.

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