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Aims: The precise determination of the stellar effective temperature of solartype stars is of extreme importance for Astrophysics. We present an effectivetemperature calibration for FGK dwarf stars using line equivalent width ratiosof spectral absorption lines. Method: The ratios of spectral line equivalentwidth can be very sensitive to effective temperature variations for a wellchosen combination of lines. We use the automatic code ARES to measure theequivalent width of several spectral lines, and use these to calibrate with theprecise effective temperature derived from spectroscopy presented in a previouswork. Results: We present the effective temperature calibration for 433 lineequivalent width ratios built from 171 spectral lines of different chemicalelements. We also make available a free code that uses this calibration andthat can be used as an extension to ARES for the fast and automatic estimationof spectroscopic effective temperature of solar type stars.

An Effective temperature calibration for solar type stars using equivalent width ratios - A fast and easy spectroscopic temperature estimation