Abstract
Periodic variations of the X- and gamma-ray flux from Geminga are interpreted as being caused by an orbital motion in a close binary system consisting of a degenerate dwarf and a black hole. The dwarf is supposed to fill its Roche lobe. The observed period P≃60 s fits the model and fixes the mass of the dwarf on M d = = 0,6 M ⊙. Gravitational radiation together with the mass transfer explain observed increase of the period, the total mass of the system M = 5M ⊙ being determined by the value of P. The energy flux in gravitational waves with ▪ = 1 30 Hz is ∼ 5.10 −3 erg s −1 cm −2 at a distance of 100 pc which is seven orders of magnitude greater than from any other known stationary source. Gamma-ray sources similar to Geminga must have periods from several minutes to several hours. Poor photon statistics makes it difficult to obtain a reliable value of P from gamma-observations. The identification of gamma- and associated X-ray sources may be improved by better localization of the formers.
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