On the tidal evolution of massive X-ray binaries - The tidal evolution time-scales for very long orbital periods

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Gravity Waves, Stellar Evolution, Stellar Mass, Stellar Motions, X Ray Sources, Angular Momentum, Differential Equations, Gravitational Waves, Legendre Functions, Main Sequence Stars, Stellar Gravitation

Scientific paper

The authors extend their previous calculations of tidal evolution rates for massive X-ray binaries to systems with very long orbital periods. They use a simple model in which internal gravity waves generated in the massive star by the time-dependent tidal potential propagate towards the surface layers where they are absorbed. The consequent energy dissipation and angular momentum transfer are responsible for the tidal evolution. It is found that for moderately low orbital frequencies, due to the interference of waves generated at different locations, the tidal angular momentum transfer is an oscillating function of orbital frequency.

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