Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..327w&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, Apr. 1, 1979, p. 327-347.
Astronomy and Astrophysics
Astrophysics
9
Astrophysics, Binary Stars, Gravitational Effects, Stellar Mass Accretion, Tides, Angular Momentum, Partial Differential Equations, Perturbation Theory, Stellar Models, Torque, Wave Propagation
Scientific paper
Accretion disks in semidetached binary systems are considered, and accretion mechanisms not requiring viscosity are studied. The first is radiative tides. Closed simple orbits exist, along which angular momentum is conserved on average. Particle trajectories perturbed away from such orbits need not conserve angular momentum even on average. The dissipative process is radiative diffusion. Tidal forces exert a torque on the disk, which removes angular momentum and permits accretion. The accretion rate is given by quadratic correlations of the linear nonaxisymmetric perturbations. Linear tidal perturbations, accretion rates, and rates of energy release by accretion are evaluated for given equilibrium states. Impact-driven accretion is also considered, where disk material is perturbed away from simple periodic orbits by an acoustic wave generated by the impact of the accretion stream. In this case, the same accretion rate is obtained as for radiative tidal accretion for given amplitude of the linear perturbation. It is concluded that radiative tides in linear regime provide a mechanism for slow accretion in disks of semidetached binary systems, provided the disk is heated by some other energy source, but cannot account for the accretion of any presently known systems.
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