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tokens: A.T. is supported by the DFG Emmy Noether grant Hi 1495/2-1 and the Bonn-Cologne Graduate School of Physics and Astronomy. I.G. would like to thank the science department and “International Research Fellow” programme of ESA-ESTEC in Noordwijk for the partial support during the completion of this paper. A.C.S. acknowledges the receipt of CNPq/BJT-A fellowship 400857/2014-6. The authors would like to thank Sophia Lianou for kindly providing us with their photometic tables and measurements of the IKN field RGB stars metallicities. We are also grateful for the helpful discussions with Søren Larsen and the anonymous referee. This research made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We acknowledge the use of the HyperLeda database ( http://leda.univ-lyon1.fr ).