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Astron. Astrophys. 328, 143-157

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Star cluster ecology

II. Binary evolution with single-star encounters

Simon F. Portegies Zwart1, 2, Piet Hut3, Stephen L. W. McMillan4, and Frank Verbunt2

1 Astronomical Institute Anton Pannekoek, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands
2 Astronomical Institute, Utrecht, Postbus 80000, 3508 TA, Utrecht, The Netherlands
3 Institute for Advanced Study, Princeton, NJ 08540, USA
4 Department of Physics and Atmospheric Science, Drexel University, Philadelphia, PA 19104, USA

Received 27 March 1997 / Accepted 17 June 1997


Three-body effects greatly complicate stellar evolution. We model the effects of encounters of binaries with single stars, based on parameters chosen from conditions prevalent in the cores of globular clusters. For our three-body encounters, we start with a population of primordial binaries, and choose incoming stars from the evolving single star populations of paper I. In addition, we study the formation of new binaries through tidal capture among the single stars. In subsequent papers in this series, we will combine stellar evolution with the dynamics of a full N-body system.

Key words: methods: numeric - celestial mechanics: stellar dynamics - binaries: close - stars: evolution - stars: blue stragglers - globular clusters: general

Send offprint requests to: Simon Portegies Zwart: spz@astro.uva.nl

© European Southern Observatory (ESO) 1997

Online publication: October 30, 1997
Last change: March 24, 1998