3D numerical simulations of circumbinary envelope formation in close binaries

Details 3D numerical simulations of circumbinary envelope formation in close binaries 3D numerical simulations of circumbinary envelope formation in close binaries

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1121....3b&link_type=abstract

SPACE PLASMA PHYSICS: School of Space Plasma Physics. AIP Conference Proceedings, Volume 1121, pp. 3-10 (2009).

Physics

Plasma Physics

Binary And Multiple Stars, Galaxy Mergers, Collisions, And Tidal Interactions, Infall, Accretion, And Accretion Disks

Scientific paper

Three-dimensional numerical simulations of the gas dynamics are used to study the structure and formation of circumbinary envelopes in close binary systems. It is shown that shape and position of a substantial part of the disk is specified by a precessional density wave. This spiral wave is due to the retrograde precession of flow lines in the binary system. On timescales comparable to the orbital period, this precessional wave (and hence an appreciable fraction of the disk) will be virtually stationary in the observer's frame, whereas positions of other elements of the flow will vary due to the orbital rotation. The periodic variations of the positions of the disk and the bow shock formed when the inner parts of the circumbinary envelope flow around the disk result in variations in both the rate of angular-momentum transfer to the disk and the flow structure near Lagrange point L3. As a consequence outer parts of the circumbinary envelope are replenished by periodic ejections from the accretion disk and circum-disk halo through the vicinity of the Lagrange point L3.

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