tokens: Acknowledgments This work was supported by Fundação para a Ciência e a Tecnologia (FCT) through national funds (UID/FIS/04434/2013) and by FEDER through COMPETE2020 (POCI-01-0145-FEDER-007672). A.C.S.R. acknowledges the support of an IA fellowship: CIAAUP-17/2015-BI in the context of the project (UID/FIS/04434/2013 POCI-01-0145-FEDER-007672). P.P.P. acknowledges the visitor’s programme grant from Instituto de Astrofisica e Ciências do Espaço, Portugal. This work has made use of the VALD database, operated at Uppsala University, the Institute of Astronomy RAS in Moscow, and the University of Vienna.
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