New Washington System CCD Standard Fields

Sixty-three new high-quality Washington system standard stars have been established in eight fields suitable for observation with a CCD. Each field includes stars with a wide color range sufficiently faint to be observed with large telescopes. The fields are equatorial (with one exception) and spaced approximately every 3 hr in right ascension. Five of the fields contain stars which are already Washington standards, thus facilitating the creation of new standards. Virtually all observations were obtained with a CCD as detector. The R (Kron-Cousins) filter is shown to accurately reproduce T1 photometry with an efficiency which is three times greater. The mean number of observations per star is 16, and the mean colors and magnitudes are determined to about 0.005 mag. The stars range in magnitude from 10≳T1≳16, with most lying between 11.5 and 14.5. The stars range in color from - 1≳(C- T1)≳4, with most lying between 0.9 and 3.0, including the full range of astrophysical interest for the system. We also derive transformation equations between some Washington and UBVRI indices for standard stars in common.