WFC3/UVIS-Cycle17: CTE External Monitoring - NGC6791

Details WFC3/UVIS-Cycle17: CTE External Monitoring - NGC6791 WFC3/UVIS-Cycle17: CTE External Monitoring - NGC6791

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011wfc..rept....6k&link_type=abstract

Instrument Science Report WFC3 2011-06, 22 pages

Astronomy and Astrophysics

Astronomy

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wfc3, Wide Field Camera 3

Scientific paper

We present preliminary results of the Charge Transfer Efficiency (CTE) evaluation based on external calibration observations from the new instrument Wide Field Camera 3 (WFC3), a fourth - generation imaging instrument which was installed in HST during Servicing Mission 4 in May 2009. Observations of the rich open cluster NGC6791 have been used to provide an initial assessment of the WFC3/UVIS CTE and its dependence with time. The observations with low-sky background (˜0.1-˜1.0 e-) for the flux range 500 to 2000 e- exhibit a clear trend with Charge Transfer Inefficiency increasing from 2% in October 2009 to 7% in the fall of 2010. The CTE degradation will continue to be monitored with both internal and external observations. Additional observations of NGC6791 and 47Tuc (CAL-12379, PI K. Noeske) planned for the fall of 2010 and spring of 2011, will be used to develop formal photometric and astrometric corrections for WFC3 science data.

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