tokens: The research activities of the Observational Astronomy Stellar Board at the Federal University of Rio Grande do Norte are supported by continuous grants from the Brazilian agencies CNPq and FAPERN and by the INCT-INEspaço. C.C. acknowledges a PDJ/CAPES fellowship (Process n °88887.114342/2015-00). B.B. acknowledges the support of the NASA Einstein Postdoctoral Fellowship. A.L. acknowledges the support from the Center for Magnetic Self-Organization, a distinguished visitor PVE/CAPES appointment at the Physics Graduate Program at UFRN, Natal, Brazil and thanks the DFTE/UFRN for hospitality.
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