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University of Nebraska - Lincoln
C. Martin Gaskell Publications
Techniques: photometric — standards — catalogs — surveys — stars: fundamental parameters
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Full-Text Articles in Physical Sciences and Mathematics
Setting Ubvri Photometric Zero-Points Using Sloan Digital Sky Survey Ugriz Magnitudes, Taylor S. Chonis, C. Martin Gaskell
Setting Ubvri Photometric Zero-Points Using Sloan Digital Sky Survey Ugriz Magnitudes, Taylor S. Chonis, C. Martin Gaskell
C. Martin Gaskell Publications
We discuss the use of Sloan Digital Sky Survey (SDSS) ugriz point-spread function (PSF) photometry for setting the zero points of UBVRI CCD images. From a comparison with the Landolt (1992) standards and our own photometry we find that there is a fairly abrupt change in B, V, R, & I zero points around g, r, i ~ 14.5, and in the U zero point at u ~ 16. These changes correspond to where there is significant interpolation due to saturation in the SDSS PSF fluxes. There also seems to be another, much smaller systematic effect for stars with g,r …