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

摘要

Aims. Precise determination of the stellar effectivetemperature of solar type stars is extremely important forastrophysics. We present an effective temperature calibration for FGKdwarf stars using the line equivalent width ratios of spectralabsorption lines. Methods. We used the automatic code ARES to measure theequivalent width for several spectral lines. These measurements wereused for calibration with the precise effective temperature derivedfrom spectroscopy presented in a previous work. Results. We present the effective temperature calibration for433line equivalent width ratios built from 171 spectral lines ofdifferent chemical elements. We also make a free code available thatuses this calibration and that can be an extension to ARES for fast andautomatic estimation of spectroscopic effective temperature of solartype stars. Key words: methods: data analysis - techniques: spectroscopic -stars: fundamental parameters - planets and satellites: formation -solar neighborhood