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A new spectroscopic calibration to determine Teff and [Fe/H] of FGK dwarfs and giants

G. D. C. Teixeira, S. G. Sousa, M. Tsantaki, M. J. P. F. G. Monteiro, N. C. Santos, G. Israelian

We present a new spectroscopic calibration for a fast estimate of Teff and [Fe/H] for FGK dwarfs and GK giant stars. We used spectra from a joint sample of 708 stars, composed by 451 FGK dwarfs and 257 GK-giant stars with homogeneously determined spectroscopic stellar parameters. We have derived 322 EW line-ratios and 100 FeI lines that can be used to compute Teff and [Fe/H], respectively. We show that these calibrations are effective for FGK dwarfs and GK-giant stars in the following ranges: 4500 K < Teff < 6500 K, 2.5 < log g < 4.9 dex, and -0.8 < [Fe/H] < 0:5 dex. The new calibration has a standard deviation of 74 K for Teff and 0.07 dex for [Fe/H]. We use four independent samples of stars to test and verify the new calibration, a sample of giant stars, a sample composed of Gaia FGK benchmark stars, a sample of GK-giant stars from the DR1 of the Gaia-ESO survey, and a sample of FGK-dwarf stars. We present a new computer code, GeTCal, for automatically producing new calibration files based on any new sample of stars.

Seismology of the Sun and the Distant Stars - Using Today's Successes to Prepare the Future - TASC2 & KASC9 Workshop - SPACEINN & HELAS8 Conference, Azores Islands, Portugal
M.J.P.F.G. Monteiro, M.S. Cunha, J.M.T.S. Ferreira

EPJ Web of Conferences
Volume 160, Number 0101
2017 October

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Fundação para a Ciência e a Tecnologia
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