Computer Science – Sound
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..679s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 1, 1986, p. 679-686.
Computer Science
Sound
56
Binary Stars, Gas Flow, Shock Waves, Stellar Mass Accretion, Stellar Models, Euler Equations Of Motion, Roche Limit, Stellar Evolution, Stellar Mass Ejection, Stellar Winds
Scientific paper
The gas flow in a semidetached binary comprising one compact (0.03-AU) star and one star of equal mass which is filling its Roche lobe is investigated theoretically. The results of numerical simulations based on the two-dimensional Euler equation and second-order upwind finite-difference scheme of Osher and Chakravarthy (1983) are presented in density contour maps and characterized in detail. It is found that when the sound speed of the gas at the surface of the noncompact star is less than A-Omega (the product of the separation of the components and the rotational angular frequency), Roche-lobe overflow leads to formation of an accretion disk with two spiral shock waves. When the sound speed is greater than A-Omega, a stellar wind with a conical shock originating at the compact star arises. The critical sound speed for a typical binary is given as 100 km/s, corresponding to a gas temperature of 10 to the 6th K.
Hachisu Izumi
Matsuda Takuya
Sawada Kei
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