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Blue straggler formation via close binary mass transfer
Lu, P.1,2; Deng, L. C.1; Zhang, X. B.1
2010-12-11
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume409Issue:3Pages:1013-1021
AbstractSeveral mechanisms of blue straggler (BS) formation via mass transfer in close binaries are studied in this work. Detailed close binary evolutionary models including both Cases A and B are calculated. We follow the evolution of a binary of 1.4 M-circle dot + 0.9 M-circle dot and compare the evolutionary behaviour of both cases. The results show that Case B is as important as Case A in forming BSs. Moreover, BSs formed via Case B are generally bluer and even more luminous than those produced by Case A, which provides a clue as to the origin of luminous BSs - such as those in M67. Based on the models calculated at 4.0 Gyr of age, a Monte Carlo simulation of the BS population in M67 is carried out using both Case A and Case B scenarios. Five BSs formed via mass transfer were predicted by our simulation and another three by dynamical merger processes. The simulation uses an artificially enlarged sample size for better statistics. The contributions from the different channels are estimated. We also investigate the influence of mass transfer efficiency beta during Roche lobe overflow on close binary evolution. The result shows that a high value of beta could reproduce the observed data better. The mechanism discussed in this work cannot predict all observed BSs in M67 because many factors are involved in such an old open cluster that affect the formation of BSs. However, we offer a better explanation of blue and luminous BSs in the binary evolution channel.
KeywordBlue Stragglers Galaxies: Star Clusters: Individual: M67
DOI10.1111/j.1365-2966.2010.17356.x
Indexed BySCI
Language英语
WOS IDWOS:000284854300010
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8073
Collection光学天文研究部
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, P.,Deng, L. C.,Zhang, X. B.. Blue straggler formation via close binary mass transfer[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,409(3):1013-1021.
APA Lu, P.,Deng, L. C.,&Zhang, X. B..(2010).Blue straggler formation via close binary mass transfer.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,409(3),1013-1021.
MLA Lu, P.,et al."Blue straggler formation via close binary mass transfer".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 409.3(2010):1013-1021.
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