WFPC2 Cycle 4 Cal: Internal MONITOR.2 - Flats Part 2

Details WFPC2 Cycle 4 Cal: Internal MONITOR.2 - Flats Part 2 WFPC2 Cycle 4 Cal: Internal MONITOR.2 - Flats Part 2

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5655c&link_type=abstract

HST Proposal ID #5655

Computer Science

Performance

Hst Proposal Id #5655

Scientific paper

Flat fields will be obtained with the photometric filter set (F336W, F439W, F555W, F675W and F814W), using the visible cal-channel lamp (VISFLAT). They will be used to monitor WFPC2's flat field response and to build a high S/N flat field database. UV flat fields will be obtained with the cal-channel's ultraviolet lamp (UVFLAT) using the UV filter set (F170W, F160BW and F336W). The UV flats will be used to monitor UV flat field stability and the stability of the Woods filter (F160BW) by using F170W as the control. The VISFLAT/UVFLAT ratio from the F336W flat fields will provide a diagnostic of the UV flat field stability and tie the UVFLAT and VISFLAT flat field patterns to a common baseline. A VISFLAT exposure with the Woods' filter (F160BW) allows its visible transmission to be monitored. Two VISFLAT exposures obtained through the LRF (FR533N), one at each gain, provide a monitor of the ADC's performance. Histograms generated from the ramp filter flats will be used to trace the ADC transfer curve. Two supplemental dark frames are obtained with CLOCKS=ON for the purpose of calibrating science frames and monitoring the dark current rate for this mode of operation. The VISFLAT and UVFLAT exposures have been packed to optimize use of each lamp-on cycle. This proposal runs every month.

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