YNAO OpenIR  > 双星与变星研究组
Evolutionary states of the two shortest period O-type overcontact binaries V382 Cyg and TU Mus
Qian SB(钱声帮)1,2,3; Yuan JZ(袁金照)1,2,3; Liu L(刘亮)1,2,3; He JJ(何家佳)1,2,3; Lajus, EF4; Kreiner, JZ5; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2007-10-01
卷号380期号:4页码:1599-1607
DOI10.1111/j.1365-2966.2007.12184.x
产权排序第1完成单位
收录类别SCI
关键词Binaries : Close Binaries : Eclipsing Stars : Early-type Stars : Evolution Stars : Individual : V382 Cyg Stars : Individual : Tu Mus
摘要Up to now, V382 Cyg and TU Mus are the only two discovered O- type overcontact binary stars with periods less than two days ( P = 1.8855 and 1.3873 d). Both systems contain a visual companion. New eclipse times and analyses of orbital period variations of the two systems are presented. It is discovered that the periods of both binaries show cyclic oscillations with periods of 47.70 and 47.73 yr, while they undergo continuous increases at rates of dP/ dt = + 4.4 x 10(-7) and + 4.0 x 10(-7) d yr(-1), respectively. The periodic variations can be interpreted as light travel times effects caused by the presence of invisible tertiary components suggesting that they may be quadruple systems. It is possible that the additional bodies may play an important role in the formation and evolution of the two massive overcontact binaries by removing angular momentum from the central systems, and causing the eclipsing pairs to have lower angular momentum and shorter initial orbital periods. In this way, the original detached systems can evolve into the present overcontact configurations via a Case A mass transfer. This is in agreement with the observed long- term period increase of V382 Cyg and TU Mus, which can be explained by mass transfers from the less massive components to the more massive ones. It is found that the time- scales of the long- term period variations of both systems are much longer than the thermal time- scales of the secondary components, but are close to their nuclear time- scales. This suggests that the two massive binaries have been through the rapid mass- transfer evolutionary stage on the thermal time- scales of the secondaries, and they are now on the slow phase of Case A mass transfer. It is shown that massive overcontact binaries are going through a short- lived overcontact configuration during the evolutionary phases of Case A mass transfer, which is different from the situation of late- type overcontact binary stars where components remain in good overcontact configuration driving by a combination of thermal relaxation oscillation and variable angular momentum loss via change in overcontact depth. This conclusion is in agreement with the distribution of overcontact binary stars along with the orbital period.
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2007-12-20
WOS记录号WOS:000250010200025
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMAL RELAXATION OSCILLATION ; ECLIPSING BINARIES ; CLOSE BINARIES ; CONTACT BINARIES ; MASS-TRANSFER ; CASE-A ; SYSTEMS ; STARS ; CYGNI ; MINIMA
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5799
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, P.R. China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, P.R. China
3.Graduate School of the CAS, Beijing, P.R. China
4.Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina
5.Mt Suhora Observatory, Cracow Pedagogical University ul. Podchorazych 2, 30-084 Krakow, Poland
推荐引用方式
GB/T 7714
Qian SB,Yuan JZ,Liu L,et al. Evolutionary states of the two shortest period O-type overcontact binaries V382 Cyg and TU Mus[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,380(4):1599-1607.
APA Qian SB.,Yuan JZ.,Liu L.,He JJ.,Lajus, EF.,...&Qian, SB .(2007).Evolutionary states of the two shortest period O-type overcontact binaries V382 Cyg and TU Mus.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,380(4),1599-1607.
MLA Qian SB,et al."Evolutionary states of the two shortest period O-type overcontact binaries V382 Cyg and TU Mus".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 380.4(2007):1599-1607.
条目包含的文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
Evolutionary states (290KB)期刊论文作者接受稿开放获取CC BY-NC-SA浏览 请求全文
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Qian SB(钱声帮)]的文章
[Yuan JZ(袁金照)]的文章
[Liu L(刘亮)]的文章
百度学术
百度学术中相似的文章
[Qian SB(钱声帮)]的文章
[Yuan JZ(袁金照)]的文章
[Liu L(刘亮)]的文章
必应学术
必应学术中相似的文章
[Qian SB(钱声帮)]的文章
[Yuan JZ(袁金照)]的文章
[Liu L(刘亮)]的文章
相关权益政策
暂无数据
收藏/分享
文件名: Evolutionary states of the two shortest period O-type overcontact binaries V382 Cyg and TU Mus.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。