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

S. G. Sousa, A. Alapini, G. Israelian, N. C. Santos

Aims. The precise determination of the stellar effective temperature of solar type stars is of extreme importance for Astrophysics. We present an effective temperature calibration for FGK dwarf stars using line equivalent width ratios of spectral absorption lines.
Methods. The ratios of spectral line equivalent width can be very sensitive to effective temperature variations for a well chosen combination of lines. We use the automatic code ARES to measure the equivalent width of several spectral lines, and use these to calibrate with the precise effective temperature derived from spectroscopy presented in a previous work.
Results. We present the effective temperature calibration for 433 line equivalent width ratios built from 171 spectral lines of different chemical elements. We also make available a free code that uses this calibration and that can be used as an extension to ARES for the fast and automatic estimation of spectroscopic effective temperature of solar type stars.

Methods: data analysis - Technics: Spectroscopy - stars: fundamental parameters - stars

Full Table 2 and line list are only available in electronic form at the CDS via anonymous ftp to ( or via

Astronomy & Astrophysics
Volume 512, Number of pages A13_1
2010 March

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia