2002/12/04 by Andrew E. Dolphin, Dolphin, Andrew E.
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0212117
2002 HST Calibration Workshop proceedings. 10 pages. Postscript copy with all figures from the author's web site, http://www.noao.edu/staff/dolphin/wfpc2_calib/
arxiv created 2002/12/04 · arxiv updated 2009/12/01
The limiting factor of the accuracy of WFPC2 photometry is the CTE loss, which has increased to the level of 50% or more for faint stars at the top of the chips. I describe recent work on characterizing this effect, and provide improved equations for CTE correction. I also examine issues affecting background measurement, which if not done correctly can introduce artificial nonlinearities into photometry.