Tidal forces and mass transfer instabilities in low-mass X-ray binaries

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Gravitational Effects, Mass Transfer, Stellar Mass, Tides, X Ray Binaries, Accretion Disks, Angular Momentum, Periodic Variations, Stellar Luminosity

Scientific paper

The exchange of angular momentum between the mass donor star and the accretion disk in low-mass X-ray binaries is investigated. It is shown that the finite pressure scale height of the mass donor prevents variations in the mass transfer are on short time scales. This excludes cyclic exchange of angular momentum between disk and orbit as a mechanism for the approximately 200 day periodic variations in the X-ray luminosity of low-mass X-ray binaries. It is also shown that a mass donor with very small mass can extract sufficient angular momentum from the accretion disk for equilibrium to be possible for the very low mass transfer rates prevalent in these systems. Finally, it is shown that, for the high mass-transfer rates in systems with massive white dwarf donor stars, the tidal forces may be insufficient to prevent the disk from growing beyond the Roche lobe.

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