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• W2102831056 abstract "We present precise effective temperatures (Teff) of 215 FGK giants determined using the method of line-depth ratios. For each star, we have measured the line depths and equivalent widths of a large number of spectral lines of low and high excitation potentials and established ∼100 relations between Teff and their ratios. Starting with an initial value Teff, the relations are then self-calibrated by an iterative process. Our final estimates have been compared with very accurate (1 per cent) published temperatures and show a good agreement. Using our calibrations, we derive precise temperatures for 215 giants with near-solar metallicity, from high-resolution (R= 42 000) and high signal-to-noise ratio (S/N = 100–250) echelle spectra, obtained with the ELODIE spectrometer at the Observatoire de Haute Provence (OHP). The range of application of the method is 3500–5700 K (G0 III–K4 III). The internal error for a single calibration is less than 95 K, while the combination of all 100 calibrations reduces the uncertainty to only 5–20 K (1σ). A big advantage of the line ratio method is its independence of interstellar reddening, and its modest sensitivity to spectral resolution, abundance, macroturbulence and other factors." @default.
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• W2102831056 date "2006-09-11" @default.
• W2102831056 modified "2023-10-01" @default.
• W2102831056 title "High-precision effective temperatures of 215 FGK giants from line-depth ratios" @default.
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• W2102831056 doi "https://doi.org/10.1111/j.1365-2966.2006.10719.x" @default.
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