2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202174From a particularly simple solution of the Ernst equation, we build a solution of the vacuum stationary axisymmetric Einstein equations depending on three parameters. The parameters are associated to the total mass of the source and its angular momentum. The third parameter produces a topological deformation of the ergosphere making it a two-sheet surface, and for some of its values forbids the Penrose process.17 pages, LaTeX, 10 EPS figures, uses graficx.styGeneral Relativity and Quantum Cosmologytext