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tokens: Acknowledgements The authors are grateful to the anonymous referee for careful and critical comments, which helped to improve the manuscript substantially. HVŞ acknowledges support from the Scientific and Technological Research Council of Turkey (TÜBİTAK) through the project grant 1001 - 115F033. EI acknowledges support from the Young Scientist Award Programme BAGEP-2016 of the Science Academy, Turkey, and is grateful to T. Reinhold and R. H. Cameron for useful discussions. GAJH would also like to acknowledge the IDEX initiative at Université Fédérale Toulouse Midi-Pyrénées (UFTMiP) for funding the STEPS programme that enabled regular research visits. This work has made use of the VALD data base, operated at Uppsala University, the Institute of Astronomy RAS in Moscow and the University of Vienna.