Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasp..119..183t&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 119, Issue 852, pp. 183-191.
Astronomy and Astrophysics
Astronomy
2
Instrumentation: Detectors, Techniques: Image Processing
Scientific paper
We show how the temporal drift of CCD amplifier bias can cause significant relative magnitude estimation error in speckle interferometric observations of multiple-star systems. When amplifier bias varies over time, the estimation error arises if the time between acquisition of dark-frame calibration data and science data is long relative to the timescale over which the bias changes. Using analysis, we show that while detector-temperature drift over time causes a variation in accumulated dark current and a residual bias in calibrated imagery, only amplifier bias variations cause a residual bias in the estimated energy spectrum. We then use telescope data taken specifically to investigate this phenomenon to show that for the detector used, temporal bias drift can cause residual energy spectrum bias as large or larger than the mean value of the noise energy spectrum. Finally, we use a computer simulation to demonstrate the effect of residual bias on differential magnitude estimation. A supplemental calibration technique is described in the appendices.
Borelli Kathy J.
Muralimanohar Hariharan
Tyler David W.
No associations
LandOfFree
The Effect of Amplifier Bias Drift on Differential Magnitude Estimation in Multiple-Star Systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Effect of Amplifier Bias Drift on Differential Magnitude Estimation in Multiple-Star Systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Effect of Amplifier Bias Drift on Differential Magnitude Estimation in Multiple-Star Systems will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1156417