Stellar Evolution and Dynamics in Star Clusters.pdf

STELLAR EVOLUTION AND DYNAMICS IN STAR CLUSTERS SIMON F. PORTEGIES ZWART 7 9 Astronomical Institute Anton Pannekoek, Kruislaan 403, NL-1098 SJ Amsterdam 9 CHRISTOPHER A. TOUT 1 Department of Mathematics, Monash University, Clayton, Victoria 3168, Australia. t c O AND HYUNG MOK LEE 0 2 Dept. of Earth Sciences, Pusan National University, Pusan 609-735, Korea 1 v Abstract. Dynamical models of star clusters are maturing in the sense that effects other than 9 0 simple point particle dynamics are taken into account. We summarize the relevance of and prospects 2 for this new generation of N-body models. 0 1 7 9 / 1. Summary and Introduction h p - Realistic star clusters are not born instantly nor are they isolated from external perturbations nor o do they consist of single time-independent equal-mass points. On the contrary a realistic star cluster r t is born gradually from a contracting gas cloud, which is embedded in the external potential of a s a galaxy, and consists of evolving single stars as well as multiple systems. Owing to lack of computer : power and partially to lack of software, computations, in which all these effects are accounted for, v i have not yet been performed. X However numerical models of star clusters are beginning to come of age and incorporate devi- r a ations from the ideal star cluster. Some models already include mutual interaction between stellar evolution and star cluster dynamics (see Chernoff Weinberg 1990; Fukushige Heggie 1995; de la Fuente Marcos 1996; Spurzem Aarseth 1996;