Abstract
The analysis of singular regions in the NUT solutions carried out in the recent paper (Manko and Ruiz 2005 Class. Quantum Grav. 22 3555) is now extended to Demiański–Newman (DN) vacuum and electrovacuum spacetimes. We show that the effect which produces the NUT parameter in a more general situation remains essentially the same as in the purely NUT solutions: it introduces the semi-infinite singularities of infinite angular momenta and positive or negative masses depending on the interrelations between the parameters; the presence of the electromagnetic field endows the singularities additionally with electric and magnetic charges. The exact formulae describing the mass, charges and angular momentum distributions in the Demiański–Newman solutions are obtained, and concise general expressions Pn = (m + iν)(ia)n, Qn = (q + ib)(ia)n for the entire set of the corresponding Beig–Simon multipole moments are derived. These moments correspond to a unique choice of the integration constant in the expression of the metric function ω which is different from the original choice made by Demiański and Newman.
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