WFPC2 Long-Term Photometric Stability

Details WFPC2 Long-Term Photometric Stability WFPC2 Long-Term Photometric Stability

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.3603h&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #36.03; Bulletin of the American Astronomical Society, Vol. 30, p.1299

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Scientific paper

We examine the WFPC2 stellar photometric monitoring data obtained over the last four years. The new analysis shows that, for bright targets, (1) the long-term photometric throughput continues to be quite stable: fluctuations are 2% or less peak-to-peak over 4 years in filters longwards of and including F336W, (2) the UV throughput has gradually evolved, that is, the clean count rates (immediately after the decons) have increased over the 4 years in some filters, e.g., F160BW by 12% in the PC, and F170W by 9%, while decreasing slightly in others, e.g., F255W by 3% and, (3) the contamination growth rates have slowed slightly for the UV filters, e.g., 1% per day to 0.5% per day in F160BW on the PC. The small discontinuity around Feb. 1995 is discussed. These results have been used to update the WFPC2 time-dependent photometric calibration within SYNPHOT.

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