Roche volume filling and the dissolution of open star clusters

	Roche volume filling and the dissolution of open star clusters
	Ernst, A.1; Berczik, P.1,2,3 ; Just, A.1; Noel, T.1
刊名	ASTRONOMISCHE NACHRICHTEN
	2015-07-01
卷号	336 期号:6 页码:577-589
关键词	celestial mechanics, stellar dynamics methods: N-body simulations open clusters and associations: general
英文摘要	From direct N-body simulations we find that the dynamical evolution of star clusters is strongly influenced by the Roche volume filling factor. We present a parameter study of the dissolution of open star clusters with different Roche volume filling factors and different particle numbers. We study both Roche volume underfilling and overfilling models and compare with the Roche volume filling case. We find that in the Roche volume overfilling limit of our simulations two-body relaxation is no longer the dominant dissolution mechanism but the changing cluster potential. We call this mechanism "mass-loss driven dissolution" in contrast to "two-body relaxation driven dissolution" which occurs in the Roche volume underfilling regime. We have measured scaling exponents of the dissolution time with the two-body relaxation time. In this experimental study we find a decreasing scaling exponent with increasing Roche volume filling factor. The evolution of the escaper number in the Roche volume overfilling limit can be described by a log-logistic differential equation. We report the finding of a resonance condition which may play a role for the evolution of star clusters and may be calibrated by the main periodic orbit in the large island of retrograde quasiperiodic orbits in the Poincare surfaces of section. We also report on the existence of a stability curve which may be of relevance with respect to the structure of star clusters. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
收录类别	SCI
语种	英语
WOS记录号	WOS:000358715500006
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5633]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Heidelberg Univ, Zentrum Astron, Astronom Rech Inst, D-69120 Heidelberg, Germany 2.Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China 3.Natl Acad Sci Ukraine, Main Astron Observ, UA-03680 Kiev, Ukraine
推荐引用方式 GB/T 7714	Ernst, A.,Berczik, P.,Just, A.,et al. Roche volume filling and the dissolution of open star clusters[J]. ASTRONOMISCHE NACHRICHTEN,2015,336(6):577-589.
APA	Ernst, A.,Berczik, P.,Just, A.,&Noel, T..(2015).Roche volume filling and the dissolution of open star clusters.ASTRONOMISCHE NACHRICHTEN,336(6),577-589.
MLA	Ernst, A.,et al."Roche volume filling and the dissolution of open star clusters".ASTRONOMISCHE NACHRICHTEN 336.6(2015):577-589.