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We describe a modified version of the NBODY6 code for simulating starclusters which greatly improves computational efficiency while sacrificinglittle in the way of accuracy. The distant force calculator is replaced by aGPU-enabled Barnes-Hut code, and integration is done with a standard leap frogscheme. Short-range forces continue to use the CPU-based fourth-order Hermitepredictor-corrector scheme of NBODY6. Our code outperforms NBODY6 for systemswith more than $3 \times 10^5$ particles and runs more than a factor 2 fasterfor systems of $10^6$ particles with similar energy conservation. Our codeshould be useful for simulating realistic dense stellar clusters, such asglobular clusters or galactic nuclei.

Accelerating NBODY6 with a GPU-Enabled Particle-Particle Particle-Tree Scheme