A Method for the Simultaneous Estimation of Atmospheric Parameters Using the Photometric Indices in the uvby Color System

Details A Method for the Simultaneous Estimation of Atmospheric Parameters Using the Photometric Indices in the uvby Color System A Method for the Simultaneous Estimation of Atmospheric Parameters Using the Photometric Indices in the uvby Color System

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aj....141..118k&link_type=abstract

The Astronomical Journal, Volume 141, Issue 4, article id. 118 (2011).

Astronomy and Astrophysics

Astronomy

Stars: Atmospheres, Stars: Fundamental Parameters

Scientific paper

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 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 1 and (b - y):m 1 pair indices. Then, a three-dimensional figure where X-, Y-, and Z-axes correspond to T 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 1 and (b - y):m 1 pair indices on each of the three projected planes, T 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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