AAS 205th Meeting, 9-13 January 2005
Session 107 Binary Stars Including Theory and Activity
Poster, Wednesday, January 12, 2005, 9:20am-6:30pm, Exhibit Hall

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[107.03] Probing the Mass-Transfer Stability Limit in Close Binaries

M. C. R. D'Souza, P. M. Motl, J. E. Tohline, J. Frank (Louisiana State University)

We present results from numerical simulations that follow the nonlinear development of mass-transfer instabilities in close binary star systems. A self-consistent-field (SCF) technique is used to construct initial equilibrium models, which are synchronously rotating, semi-detached, polytropic stars on circular orbits. These models are evolved with an Eulerian, finite-difference hydrodynamics code in a fully self-consistent manner. Results are presented for binary systems having a wide range of initial conditions; emphasis is placed on systems in which the mass-transfer stream directly impacts the surface of the accreting star. Some systems are dynamically unstable and result in a merger; others approach a long-term, stable phase of mass transfer. The time-evolutionary behavior of the binary separation, mass transfer rate, spin angular momentum of the accretor, and gravitational wave strain are presented.

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© 2004. The American Astronomical Society.