Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-05
Astronomy and Astrophysics
Astrophysics
6 pages, LaTeX, two eps figures, Astronomy and Astrophysics, accepted
Scientific paper
10.1051/0004-6361:20053288
Numerical computation of the time evolution of the mass transfer rate in a close binary can be and, in particular, has been a computational challenge. Using a simple physical model to calculate the mass transfer rate, we show that for a simple explicit iteration scheme the mass transfer rate is numerically unstable unless the time steps are sufficiently small. In general, more sophisticated explicit algorithms do not provide any significant improvement since this instability is a direct result of time discretization. For a typical binary evolution, computation of the mass transfer rate as a smooth function of time limits the maximum tolerable time step and thereby sets the minimum total computational effort required for an evolutionary computation. By methods of ``Controlling Chaos'' it can be shown that a specific implicit iteration scheme, based on Newton's method, is the most promising solution for the problem.
Buening A.
Ritter Hans
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