The effective temperatures and colours of G and K stars.

The IR flux ratio method (Blackwell and Shallis, 1977) is used in conjunction with new tables of synthetic IR colors to determine temperature scales for G and K dwarf and giant stars. The temperatures of 95 stars are listed. The colors and flux ratios for the model atmospheres in the grid of yellow and red giant models of Gustafsson et al. (1975) and Bell et al. (1976) are presented. Also, IR colors for a set of dwarf models, computed using the same methods as used in the giant models, are given. In addition, the synthetic spectra and colors for the Vega model (Dreiling and Bell, 1980) are included.