The blue stragglers formed via mass transfer in old open clusters

	The blue stragglers formed via mass transfer in old open clusters
	Tian, B; Deng, L; Han ZW(韩占文); Zhang, XB
刊名	ASTRONOMY & ASTROPHYSICS
	2006-08
卷号	455 期号:1 页码:247-254
关键词	stars : blue stragglers stars : binaries : close Galaxy : open clusters and associations : individual : M 67
ISSN号	0004-6361
通讯作者	Tian, B (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
产权排序	第三完成单位
英文摘要	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.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	STANDARD STELLAR LIBRARY ; CLOSE BINARIES ; EVOLUTIONARY SYNTHESIS ; GLOBULAR-CLUSTERS ; M67 ; STARS ; COLLISIONS ; TEMPERATURE ; POPULATIONS ; OPACITIES
收录类别	SCI ; EI
原文出处	http://www.aanda.org/10.1051/0004-6361:20064879
语种	英语
WOS记录号	WOS:000239455100025
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4426]
专题	云南天文台_大样本恒星演化研究组
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.(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.