Abstract
ABSTRACT The PDS/Monet measuring engine at NOAO was used to obtain photometry of nearly 10,000 stars in the NGS/POSS and 2,000 stars on the ESO/SRC Survey glass plates. These measurements have been used to show that global transformation functions exist that allow calibration of stellar photometry from any blue or red plate to equivalent Johnsen B and Cousins R photoelectric magnitudes. We have characterized the four transformation functions appropriate for the POSS O and E and ESO/SRC J and R plates, and found that within the measurement uncertainties they vary from plate-to-plate only by photometric zero-point offsets. A method is described to correct for the zero-point shifts and to obtain calibrated B and R photometry of stellar sources to an average accuracy of 0.3-0.4 magnitudes within the range R between values of 8 and 19.5 for red plates in both surveys, B between values of 9 and 20.5 on POSS blue plates, and B between values of 10 and 20.5 on ESO/SRC blue plates. This calibration procedure makes it possible to obtain rapid photometry of very large numbers of stellar sources.
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