Passbands and Theoretical Colors for the Washington System

The passbands of the Washington system ( C , M , T 1 , T 2 ) have been checked through synthetic photometry of the Vilnius spectra and comparison of observed and synthetic color‐color relations. Using the derived passbands, theoretical colors were computed using the grid of ATLAS no‐overshoot models of Castelli. These can be used for calibration of the Washington system.