Bandwidth Stability of the WFPC2 Narrow Band and Linear Ramp Filters

Details Bandwidth Stability of the WFPC2 Narrow Band and Linear Ramp Filters Bandwidth Stability of the WFPC2 Narrow Band and Linear Ramp Filters

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfpc.rept....5l&link_type=abstract

Instrument Science Report WFPC2 2009-05, 7 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 2, Wfc2

Scientific paper

As part of the WFPC2 close-out calibrations, we examine the stability of the bandwidths of the narrow band and linear ramp filters. We measure the FWHM of the spots produced by VISFLAT exposures using linear ramp filters crossed with narrow band filters. We do this for eight different pairings of narrow band and linear ramp filters. We then compare results from 1995 and 2008, and find negligible change in the bandpass FWHM for all eight filter pairs tested. Any change in the combined bandwidth is less than about 1% of the bandwidth. Our constraints on any changes in the narrow band filters (taken alone) are less strong, but we can rule out bandwidth changes larger than about 5% for typical narrow band filters (16% for the narrowest filter, F656N).

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