Abstract
A new method was developed to estimate the effective temperature, surface gravity, and metallicity of cool stars using only photometric indices in the uvby color system. In a graphical method, T{sub eff} and log g were determined for all of the different values of [Fe/H] using model atmosphere grids with respect to (b - y):c{sub 1} and (b - y):m{sub 1} pair indices. Then, a three-dimensional figure where X-, Y-, and Z-axes correspond to T{sub eff}, log g, and [Fe/H] was produced. By reading an intersection of two curves formed by a connection of three parameters obtained from the (b - y):c{sub 1} and (b - y):m{sub 1} pair indices on each of the three projected planes, T{sub eff}, log g, and [Fe/H] were determined simultaneously. In addition, an analytical method was devised based on the same algorithm developed for the graphical method. The new method was applied to a number of field dwarfs and giants, and the results were compared with those from a spectroscopic method and other photometric calibrations.
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