tokens: The authors are grateful to the anonymous referee for the important suggestions/corrections on this paper. Part of this work was supported by CAPES/Cofecub Project 712/2011. BF thanks CNPq Project 142849/2010-3. JGH acknowledges partial support from FAPESP Proc. No. 2010/50930-6. This publication makes use of data products from the 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This publication makes use of data products from the WISE , which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration.
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