Binary evolution and double sequences of blue stragglers in globular clusters. Issue Volume 14:Issue S343(2019) (August 2018)

• Record Type: Journal Article
• Authors: Jiang, Dengkai; Chen, Xuefei; Li, Lifang; Han, Zhanwen
• Editors: Kerschbaum, Franz; Groenewegen, Martin; Olofsson, Hans
• Is Part Of: Proceedings of the International Astronomical Union. Volume 14:Issue S343(2019)
• Page Start: 427
• Page End: 428
• Publication Date: 2018-08
• Subjects: binaries: general, -- blue stragglers, -- globular clusters, -- stars: evolution; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921318005069
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: Binary evolution can produce different blue-straggler binaries, for example, blue stragglers with a bright, red component, or with a faint, blue component. In globular clusters, these blue-straggler binaries are generally observed as a single star, because two components can not be distinguished. Therefore, these blue-straggler binaries can be located in different regions of the color-magnitude diagram of globular clusters, e.g. blue sequence and red sequence observed in M30. We suggest that binary evolution can contribute to the blue stragglers in both of the sequences. Some blue stragglers in the blue sequence may have a faint white dwarf companion, while the red sequence includes some binaries experiencing mass transfer. It should be noted that the red sequence may also have other binaries, for example, the binaries just finished the mass transfer, and the binaries including a blue straggler (the accretors) that have evolved away from the blue sequence.