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Paper: A Comparison of SDSS Standard Star Catalog for Stripe 82 with Stetson's Photometric Standards
Volume: 364, The Future of Photometric, Spectrophotometric, and Polarimetric Standardization
Page: 165
Authors: Ivezic, Z.; Smith, J.A.; Miknaitis, G.; Lin, H.; Tucker, D.L.; Lupton, R.; Knapp, G.R.; Gunn, J.E.; Strauss, M.; Holtzman, J.; Kent, S.; Yanny, B.; Schlegel, D.; Finkbeiner, D.; Padmanabhan, N.; Rockosi, C.; Juric, M.; Bond, N.; Lee, B.; Jester, S.; Harris, H.; Harding, P.; Brinkmann, J.; York, D.
Abstract: We compare Stetson's photometric standards with measurements listed in a standard star catalog constructed using repeated SDSS imaging observations. The SDSS catalog includes over 700,000 candidate standard stars from the equatorial stripe 82 (|DEC| < 1.°266 ) in the RA range 20h 34m to 4h 00m, and with the r band magnitudes in the range 14–21. The distributions of measurements for individual sources demonstrate that the SDSS photometric pipeline correctly estimates random photometric errors, which are below 0.m01 for stars brighter than (19.5, 20.5, 20.5, 20, 18.5) in ugriz, respectively (about twice as good as for individual SDSS runs). We derive mean photometric transformations between the SDSS gri and the BV RI system using 1165 Stetson stars found in the equatorial stripe 82, and then study the spatial variation of the difference in zeropoints between the two catalogs. Using third-order polynomials to describe the color terms, we find that photometric measurements for main-sequence stars can be transformed between the two systems with systematic errors smaller than a few millimagnitudes. The spatial variation of photometric zeropoints in the two catalogs typically does not exceed 0.m01. Consequently, the SDSS Standard Star Catalog for Stripe 82 can be used to calibrate new data in both the SDSS ugriz and the BV RI systems with a similar accuracy.
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