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Modeling blue stragglers in young clusters
Lu, Pin1,2; Deng, Li-Cai1; Zhang, Xiao-Bin1
AbstractA grid of binary evolution models are calculated for the study of a blue straggler (BS) population in intermediate age (log Age = 7.85 - 8.95) star clusters. The BS formation via mass transfer and merging is studied systematically using our models. Both Case A and B close binary evolutionary tracks are calculated for a large range of parameters. The results show that BSs formed via Case B are generally bluer and even more luminous than those produced by Case A. Furthermore, the larger range in orbital separations of Case B models provides a probability of producing more BSs than in Case A. Based on the grid of models, several Monte-Carlo simulations of BS populations in the clusters in the age range are carried out. The results show that BSs formed via different channels populate different areas in the color magnitude diagram (CMD). The locations of BSs in CMD for a number of clusters are compared to our simulations as well. In order to investigate the influence of mass transfer efficiency in the models and simulations, a set of models is also calculated by implementing a constant mass transfer efficiency, beta = 0.5, during Roche lobe overflow (Case A binary evolution excluded). The result shows BSs can be formed via mass transfer at any given age in both cases. However, the distributions of the BS populations on CMD are different.
KeywordStars: Blue Stragglers Stars: Binaries: Close
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WOS IDWOS:000297441300009
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Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Lu, Pin,Deng, Li-Cai,Zhang, Xiao-Bin. Modeling blue stragglers in young clusters[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(11):1336-1350.
APA Lu, Pin,Deng, Li-Cai,&Zhang, Xiao-Bin.(2011).Modeling blue stragglers in young clusters.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(11),1336-1350.
MLA Lu, Pin,et al."Modeling blue stragglers in young clusters".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.11(2011):1336-1350.
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