IRFM Teff calibrations for cluster and ﬁeld giants in the Vilnius, Geneva, RI(c) and DDO photometric systems
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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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