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Sub-Stepping as a WFPC Observing Strategy

Next: Richardson-Lucy Co-Addition

Sub-Stepping as a WFPC Observing Strategy

W. Freudling

Space Telescope - European Coordinating Facility, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany

Abstract:

WFPC images offer a wide field of view but significantly undersample the PSF. A strategy to recover some of the resolution lost by undersampling is to split the exposure time into several images, which are shifted by a fraction of the pixel size. These images can subsequently be combined with a modified Richard-Lucy algorithm. One of the challenges of this approach is the treatment of cosmic ray hits. A procedure to simultaneously co-add images with different PSFs in the presence of CR hits is presented here. An IRAF implementation (Freudling, 1993) was tested on both simulations and real WFPC data. These tests show the viability of the proposed strategy.

Keywords: WFPC, co-addition, cosmic rays

rlw@sundog.stsci.edu
Fri Apr 15 17:27:10 EDT 1994