Statistics – Computation
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224..307s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Jan. 15, 1987, p. 307-322.
Statistics
Computation
76
Accretion Disks, Astronomical Models, Binary Stars, Computational Astrophysics, Gas Flow, Stellar Mass Accretion, Euler Equations Of Motion, Hydrodynamic Equations, Particle Motion, Shock Waves, Stellar Mass Ejection, Tides
Scientific paper
Two-dimensional hydrodynamic calculations of a gas flow in a semi-detached close binary system with mass ratio unity are carried out. The Euler equation is solved using the second-order Osher scheme in a multi-box type of grid, which gives a high resolution about a mass-accreting compact object. Spiral-shaped shock waves in the accretion disc are found to extend down to r = 0.01 A, where r and A are the radial distance from the compact star and the separation of two stars respectively. It means that the tidal effect by the mass-losing star is important even so close to the compact object. It is also confirmed that the gas particles lose their angular momentum at the shocks and can spiral in without the help of a turbulent viscosity. The fundamental assumptions of the standard accretion disc model, i.e. an axisymmetric thin disc, the important role of the turbulent viscosity etc., are questioned.
Hachisu Izumi
Inoue Minoru
Matsuda Takuya
Sawada Keisuke
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