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The charge transfer efficiency and calibration of wfpc2
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dolphin, Andrew E. |
| Copyright Year | 2000 |
| Description | A new determination of WFPC2 photometric corrections is presented, using HSTphot reduction of the WFPC2 Omega Centauri and NGC 2419 observations from January 1994 through March 2000 and a comparison with ground-based photometry. No evidence is seen for any position-independent photometric offsets (the "long-short anomaly"); all systematic errors appear to be corrected with the CTE and zero point solution. The CTE loss time dependence is determined to be very significant in the Y direction, causing time-independent CTE solutions to be valid only for a small range of times. On average, the present solution produces corrections similar to Whitmore, Heyer, & Casertano, although with an improved functional form that produces less scatter in the residuals and determined with roughly a year of additional data. In addition to the CTE loss characterization, zero point corrections are also determined as functions of chip, gain, filter, and temperature. Of interest, there are chip-to-chip differences of order 0.01 - 0.02 magnitudes relative to the Holtzman et al. calibrations, and the present study provides empirical zero point determinations for the non-standard filters such as the frequently-used F450W, F606W, and F702W. |
| File Size | 1616419 |
| File Format | |
| Language | English |
| Publisher Date | 2000-06-01 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Characterization Time Dependence Systematic Errors Calibrating Chips Magnitude Charge Transfer Photometry Centaurus Constellation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
