Temperatures for A0-K0 Supergiants from 13-Color Photometry

Observations on the 13-color photometric system are reported for 71 A0-K0 supergiant stars brighter than V=6.0. Three independent methods to determine the effective temperatures for A0-K0 supergiants from their 13C photometry are discussed: 1) Calibrations between T$_eff$ and reddening-free indices are developed; temperatures were collected from the literature for the calibration stars, and most of them were spectroscopically determined. 2) An empirical correlation between intrinsic colors in the 13C system and T$_eff$ has been derived. 3) The unreddened colors are compared with synthetic colors calculated by Kurucz (1989); this leads to simultaneous estimates for T$_eff$ and log $g$. The estimated uncertainties in T$_eff$ by the three methods are comparable and are approximately plus or minus 200-300K. (SECTION: Stars)