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On the minimum mass ratio of W UMa binaries
Jiang DK(姜登凯)1,2,3; Han ZW(韩占文)1,3; Wang JC(王建成)1,3; Jiang TY(姜天雨)1,2,3; Li LF(李立芳)1,3; Jiang, DK (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Yunnan Province, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2010-07-11
卷号405期号:4页码:2485-2491
DOI10.1111/j.1365-2966.2010.16615.x
产权排序第1完成单位
收录类别SCI
关键词Instabilities Binaries: Close Blue Stragglers Stars: Evolution Stars: Rotation
摘要Using Eggleton's stellar evolution code, we study the minimum mass ratio (q(min)) of W Ursae Majoris (W UMa) binaries that have different primary masses. It is found that the minimum mass ratio of W UMa binaries decreases with increasing mass of the primary if the primary's mass is less than about 1.3 M(circle dot), while above this mass the ratio is roughly constant. By comparing the theoretical minimum mass ratio with observational data, it is found that the existence of low-q systems can be explained by the different structure of primaries with different masses. This suggests that the dimensionless gyration radius (k2(1)) and thus the structure of the primary is very important in determining the minimum mass ratio. In addition, we investigate the mass loss during the merging process of W UMa systems and calculate the rotation velocities of the single stars formed by mergers of W UMa binaries due to tidal instability. It is found that in the case of conservation of mass and angular momentum, the merged single stars rotate with an equatorial velocity of about similar to 588-819 km s-1, which is much larger than their break-up velocities (v(b)). This suggests that the merged stars should extend to a very large radius (similar to 3.7-5.3 times the radii of the primaries) or else W UMa systems should lose a large amount of mass (similar to 21-33 per cent of the total mass) during the merging process. If the effect of magnetic braking is considered, the mass loss decreases to similar to 12-18 per cent of the total mass. This implies that significant angular momentum and mass might be lost from W UMa systems in the course of the merging process, and this kind of mass and angular momentum loss might be driven by the release of orbital energy of the secondaries, similarly to common-envelope evolution.
项目资助者Chinese Natural Science Foundation [10673029, 10773026, 10521001, 2007CB815406, 10821061] ; Foundation of Chinese Academy of Sciences [KJCX2-YW-T24] ; Yunnan Natural Science Foundation [2007A113M]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2010-07-13
WOS记录号WOS:000279450900029
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]MAJORIS-TYPE SYSTEMS ; COMMON-ENVELOPE EVOLUTION ; WUMA-TYPE BINARIES ; CONTACT BINARIES ; BLUE-STRAGGLERS ; URSAE-MAJORIS ; PHYSICAL PARAMETERS ; ECLIPSING BINARIES ; STELLAR EVOLUTION ; GLOBULAR-CLUSTERS
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被引频次:39[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/114a53/4495
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
通讯作者Jiang, DK (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Yunnan Province, Peoples R China.
作者单位1.National Astronomical Observatories, Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan Province 650011, China
2.Graduate University of Chinese Academy of Sciences, Beijing 100039, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
第一作者单位中国科学院云南天文台
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Jiang DK,Han ZW,Wang JC,et al. On the minimum mass ratio of W UMa binaries[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,405(4):2485-2491.
APA Jiang DK,Han ZW,Wang JC,Jiang TY,Li LF,&Jiang, DK .(2010).On the minimum mass ratio of W UMa binaries.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,405(4),2485-2491.
MLA Jiang DK,et al."On the minimum mass ratio of W UMa binaries".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 405.4(2010):2485-2491.
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