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X. Peng, V. M. Gokhale, J. Frank, M. C. R. D'Souza, J. E. Tohline (Louisiana State University)
We present an analytic and numerical study of the evolution of semi-detached ultra-compact double-degenerate binaries. Considering the effects of direct impact and non-conservative accretion, we compute the mass transfer rate and investigate the structure and stability of these systems. We find that these systems arrive to evolutionary cross-roads as they come into contact at very short orbital periods driven by gravitational radiation. Their fate is decided in a rapid evolutionary phase leading to a merger, or tidal disruption of the donor in most cases. However, some of the unstable mass transfer cases may undergo a separation "bounce" and survive as AM CVn binaries after a rapid mass transfer phase.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.