tokens: This paper is based on observations made at the Laboratório Nacional de Astrofísica (LNA), Itajubá-MG, Brazil. The authors thank the referee Dr D. Pascu for his constructive comments. BM thanks the financial support by the CAPES/Brazil. MA thanks the CNPq (Grants 473002/2013-2 and 308721/2011-0) and FAPERJ (Grant E-26/111.488/2013). RVM acknowledges the following grants: CNPq-306885/2013, CAPES/Cofecub-2506/2015, FAPERJ/PAPDRJ-45/2013 and FAPERJ/CNE/05-2015. JIBC acknowledges CNPq for a PQ2 fellowship (process number 308489/2013-6). ADO is thankful for the support of the CAPES (BEX 9110/12-7) FAPERJ/PAPDRJ (E-26/200.464/2015) grants. ARGJ thanks CAPES/Brazil.
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