The blue stragglers formed via mass transfer in old open clusters

doi:10.1051/0004-6361:20064879

YNAO OpenIR > 大样本恒星演化研究组

	The blue stragglers formed via mass transfer in old open clusters
	Tian, B; Deng, L; Han ZW(韩占文); Zhang, XB; Tian, B (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
发表期刊	ASTRONOMY & ASTROPHYSICS
	2006-08
卷号	455 期号:1 页码:247-254
DOI	10.1051/0004-6361:20064879
产权排序	第3完成单位
收录类别	SCI ; EI
关键词	Stars : Blue Stragglers Stars : Binaries : Close Galaxy : Open Clusters And Associations : Individual : m 67
摘要	In this paper, we present the simulations for the primordial blue stragglers in the old open cluster M 67 based on detailed modelling of the evolutionary processes. The principal aim is to discuss the contribution of mass transfer between the components of close binaries to the blue straggler population in M 67. Methods. First, we followed the evolution of a binary of 1.4 M-circle dot + 0.9 M-circle dot. The synthetic evolutionary track of the binary system revealed that a primordial blue straggler had a long lifetime in the observed blue straggler region of color-magnitude diagram. Second, a grid of models for close binary systems experiencing mass exchange were computed from 1 Gyr to 6 Gyr in order to account for primordial blue-straggler formation in a time sequence. Based on such a grid, Monte- Carlo simulations were applied for the old open cluster M 67. Results. Adopting appropriate orbital parameters, 4 primordial blue stragglers were predicted by our simulations. This was consistent with the observational fact that only a few blue stragglers in M 67 were binaries with short orbital periods. An upper boundary of the primordial blue stragglers in the color-magnitude diagram (CMD) was defined and could be used to distinguish blue stragglers that were not formed via mass exchange. Using the grid of binary models, the orbital periods of the primordial BSs could be predicted. Conclusions. Compared with the observations, it is clear that the mechanism discussed in this work alone cannot fully predict the blue straggler population in M 67. There must be several other processes also involved in the formation of the observed blue stragglers in M 67.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-6361
URL	查看原文
WOS记录号	WOS:000239455100025
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	STANDARD STELLAR LIBRARY ; CLOSE BINARIES ; EVOLUTIONARY SYNTHESIS ; GLOBULAR-CLUSTERS ; M67 ; STARS ; COLLISIONS ; TEMPERATURE ; POPULATIONS ; OPACITIES
引用统计	被引频次：63[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4426
专题	大样本恒星演化研究组
通讯作者	Tian, B (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
推荐引用方式 GB/T 7714	Tian, B,Deng, L,Han ZW,et al. The blue stragglers formed via mass transfer in old open clusters[J]. ASTRONOMY & ASTROPHYSICS,2006,455(1):247-254.
APA	Tian, B,Deng, L,韩占文,Zhang, XB,&Tian, B .(2006).The blue stragglers formed via mass transfer in old open clusters.ASTRONOMY & ASTROPHYSICS,455(1),247-254.
MLA	Tian, B,et al."The blue stragglers formed via mass transfer in old open clusters".ASTRONOMY & ASTROPHYSICS 455.1(2006):247-254.

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