Submitted per the request of the WFPC2 Instrument Scientist-John Biretta. Assigned ID: 1031 ----- Attempting Submission 1 (Fri Feb 02 14:40:43 CST 2007) ----- Emission-line imaging with the WFPC2 has been dominated by use of the F656N, F 658N, and F502N filters.These filters require on-orbit calibration in order to convert their signals to absolute energy surface brightness units. This has previously been done, but there is a question of time variation of their properties and this will be addressed by special observations of the Orion Nebula as part of calibration program 11038. This archive program will use the previously adopted method that uses a well-calibrated long-slit reference sample to calibrate the data. There is also a mid-lifetime set that will allow tracking variations with time. I will also determine if a new set of multi-aperture groundbased data is satisfactory for use as a reference source and if it is, to determine variations in the calibration constants across the individual CCD detectors and with better time resolution by using five additional studies.

ISM AND CIRCUMSTELLAR MATTER 12 42421 true 0.0 false false false false false false SUPPORTED