8 citations · 8 across the 1 of their papers we have counts for
3 papers
Li-rich giant stars under scrutiny: Binarity, magnetic activity and the evolutionary status after Gaia DR2
B. F. O. Gonçalves, J. S. da Costa, L. de Almeida +2
We present a study of the evolutionary state of a few lithium-rich giant stars based on the Gaia DR2 parallaxes and photometry. We also investigate the chromospheric activity, the…
The Exact Foldy-Wouthuysen Transformation for a Dirac Theory Revisited
Bruno Gonçalves, Mário M. Dias Júnior, Baltazar J. Ribeiro
The Exact Foldy-Wouthuysen transformation (EFWT) method is generalized here. In principle, it is not possible to construct the EFWT to any Hamiltonian. The transformation condition…
Birefringence phenomena revisited
Dante D. Pereira, Baltazar J. Ribeiro, Bruno Gonçalves
The propagation of electromagnetic waves is investigated in the context of the isotropic and nonlinear dielectric media at rest in the eikonal limit of the geometrical optics. Taki…