Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..377g&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Dense Stellar Systems
Scientific paper
Spherically symmetric star clusters containing a large amount of primordial binaries or planetary systems are studied using a hybrid method consisting of a gas dynamical model for the single stars and a Monte Carlo treatment for relaxation of binaries and their interactions with other stars and binaries. Each binary encounter is investigated by means of a highly accurate direct few-body integrator (adopted from NBODY6++). The evolution of individual binary and planetary orbital parameters can be directly followed and the cross sections for interesting physical processes involved binaries can be computed. Cross sections are obtained from a sampling of several hundred thousands of scattering events as they occur in a real cluster evolution including mass segregation of binaries gravothermal collapse and reexpansion binary burning phase and gravothermal oscillations. For the first time we are able to present empirical cross sections for eccentricity variation of binaries in close three- and four-body encounters. It is found that a large fraction of four-body encounters results in merging. We are also able for the first time to follow the changes of orbital parameters of primordial planetary systems in the course of cluster evolution.
Giersz Mirek
Lin Doug
Spurzem Rainer
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