Monte Carlo simulations of star clusters - II. Tidally limited, multimass systems with stellar evolution

被引:60
作者
Giersz, M [1 ]
机构
[1] Polish Acad Sci, N Copernicus Astron Ctr, PL-00716 Warsaw, Poland
关键词
methods : numerical; stars : kinematics; globular clusters : general;
D O I
10.1046/j.1365-8711.2001.04337.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A revision of Stodolkiewicz's Monte Carlo code is used to simulate evolution of large star clusters. The new method treats each superstar as a single star and follows the evolution and motion of all individual stellar objects. A survey of the evolution of N-body systems influenced by the tidal field of a parent galaxy and by stellar evolution is presented. The process of energy generation is realized by means of appropriately modified versions of Spitzer's and Mikkola's formulae for the interaction cross-section between binaries and field stars and binaries themselves. The results presented are in good agreement with theoretical expectations and the results of other methods (Fokker-Planck, Monte Carlo and N-body). The initial rapid mass loss, resulting from stellar evolution of the most massive stars, causes expansion of the whole cluster and eventually leads to the disruption of less bound systems (W-0 = 3). Models with larger W-0 survive this phase of evolution and then undergo core collapse and subsequent post-collapse expansion, like isolated models. The expansion phase is eventually reversed when tidal limitation becomes important. The results presented are the first major step in the direction of simulating evolution of real globular clusters by means of the Monte Carlo method.
引用
收藏
页码:218 / 230
页数:13
相关论文
共 53 条
[1]   Star cluster simulations: The state of the art [J].
Aarseth, SJ .
CELESTIAL MECHANICS & DYNAMICAL ASTRONOMY, 1999, 73 (1-4) :127-137
[2]   Basic N-body modelling of the evolution of globular clusters - I. Time scaling [J].
Aarseth, SJ ;
Heggie, DC .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 297 (03) :794-806
[3]   From NBODY1 to NBODY6: The growth of an industry [J].
Aarseth, SJ .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1999, 111 (765) :1333-1346
[4]  
AARSETH SJ, 1985, MULTIPLE TIME SCALES, P377
[5]  
BAUMGARDT H, 2001, IN PRESS ASP C SER, V228
[6]   EVOLUTION OF GLOBULAR-CLUSTERS IN THE GALAXY [J].
CHERNOFF, DF ;
WEINBERG, MD .
ASTROPHYSICAL JOURNAL, 1990, 351 (01) :121-156
[7]  
Djorgovski S. G, 1993, ASP C SER, V50
[8]   Anisotropic Fokker-Planck models for the evolution of globular star clusters: The core-halo connection [J].
Drukier, GA ;
Cohn, HN ;
Lugger, PM ;
Yong, H .
ASTROPHYSICAL JOURNAL, 1999, 518 (01) :233-245
[9]   Dynamical evolution of rotating stellar systems - 1. Pre-collapse, equal-mass system [J].
Einsel, C ;
Spurzem, R .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 302 (01) :81-95
[10]   The time-scale of escape from star clusters [J].
Fukushige, T ;
Heggie, DC .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2000, 318 (03) :753-761