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Octo-Tiger models mass transfer in binary systems using a Cartesian adaptive mesh refinement grid. It simulates the evolution of star systems based on a modified fast multipole method (FMM) on adaptive octrees. The code takes shock heating into account and uses the dual energy formalism with an ideal gas equation of state; it also conserves linear and angular momenta to machine precision. Octo-Tiger is implemented in C++ and is parallelized using the High Performance ParalleX (HPX) runtime system.