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tokens: C.S. was partially supported by NSF grant AST-1616040, and by the Rex G. Baker, Jr. Endowment at the University of Texas. C.S. also thanks the Dipartimento di Fisica—Università di Roma Tor Vergata for a Visiting Scholar grant, and INAF—Osservatorio Astronomico di Roma for his support during his stay. We thank the reviewer for the precise notes and the useful suggestions to improve our work. This research has made use of the services of the ESO Science Archive Facility. This work has made use of the VALD database ( http://vald.astro.univie.ac.at/vald3/php/vald.php ), operated at Uppsala University, the Institute of Astronomy RAS in Moscow, and the University of Vienna.