Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..152l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 1, Sept. 1, 1992, p. 152-158.
Astronomy and Astrophysics
Astronomy
37
Accretion Disks, Binary Stars, Computerized Simulation, Stellar Evolution, Stellar Models, Cataclysmic Variables, Novae, Three Dimensional Models
Scientific paper
The smooth particle hydrodynamics (SPH) method by Monaghan (1985) is utilized in these 3D simulations of polytropic accretion discs for the binary SS Cyg. The analysis assumes primary and secondary masses of 1.3 and 0.8 solar mass, respectively, and a mass ratio of 1.625. The results are compared to a similar simulation by Molteni et al. (1991) in which the mass ratio was unity. The analysis is conducted for gamma = 1.01, 1.1, and 1.2, and disc formation is inhibited for values over 1.1 demonstrating the lack of z-resolution in the 2D model. The validity of thin-disc approximation independent of mass ratio is confirmed by the simulation for gamma = 1.01, and the outer half of the disc is found to deviate significantly from the Keplerian rotation law. Asymmetries are noted in the disc shape, and an 'over-disc stream' is defined that collides edge-on with the disc.
Belvedere Gaetano
Lanzafame Giuseppe
Molteni Diego
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