The gamma-ray source Geminga - A white dwarf, rotating around a black hole?

Astronomy and Astrophysics – Astronomy

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Astronomical Models, Binary Stars, Black Holes (Astronomy), Gamma Ray Astronomy, Stellar Orbits, White Dwarf Stars, Accretion Disks, Gravitational Waves, Roche Limit, Stellar Rotation

Scientific paper

A 'kinematic' model of Geminga is proposed which explains the observed period and the rate of its increase. The model is based on the hypothesis that the observed period is connected with the orbital period of a close binary system consisting of (1) a white dwarf filling the Roche lobe with a mass of 0.6 solar mass and (2) a black hole with a mass of 4.4 solar masses. Two processes are noted to be governing in this close binary system: (1) intense mass transfer from the white dwarf to the black hole and (2) loss by the system of rotational motion due to the emission of gravitational radiation.

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