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tokens: Based on observations obtained at the SOAR telescope, which is a joint project of the Ministério da Ciência, Tecnologia, e Inovação (MCTI) da República Federativa do Brasil, the US National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC) and Michigan State University (MSU). We thank an anonymous referee for important comments and suggestions. Partial financial support for this research comes from CNPq and PRONEX-FAPERGS/CNPq (Brazil). BB and BD acknowledge partial financial support from FAPESP, CNPq, CAPES, and the LACEGAL project. LK, BB, and BD also thank CAPES/CNPq for their financial support with the PROCAD project number 552236/2011-0.