Mon. Not. R. Astron. Soc., 371, 879-884 (2006/September-2)
High-precision effective temperatures of 215 FGK giants from line-depth ratios.
KOVTYUKH V.V., SOUBIRAN C., BIENAYME O., MISHENINA T.V. and BELIK S.I.
Abstract (from CDS):
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 Teffand 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 = 42000) 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 3500-5700K (G0III-K4III). The internal error for a single calibration is less than 95K, while the combination of all 100 calibrations reduces the uncertainty to only 5-20K (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.
2006 The Authors. Journal compilation © 2006 RAS
stars: fundamental parameters
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<Available at CDS (J/MNRAS/371/879): table1.dat>
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