IRFM Teff calibrations for cluster and field giants in the Vilnius, Geneva, RI(c) and DDO photometric systems
Abstract
Based on a large sample of disk and halo giant stars for which accurate effective temperatures derived through the
InfraRed Flux Method (IRFM) exist, a calibration of the temperature scale in the Vilnius, Geneva, RI(C) and DDO photometric
systems is performed. We provide calibration formulae for the metallicity-dependent Teff vs. color relations as well as grids of
intrinsic colors and compare them with other calibrations. Photometry, atmospheric parameters and reddening corrections for
the stars of the sample have been updated with respect to the original sources to reduce the dispersion of the fits. Application of
our results to Arcturus leads to an effective temperature in excellent agreement with the value derived from its angular diameter
and integrated flux. The effects of gravity on these Teff vs. color relations are also explored by taking into account our previous
results for dwarf stars.
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