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Orbital period investigations of two short-period early-type overcontact binaries BH Cen and V701 Sco in two extremely young galactic clusters IC 2944 and NGC 6383
Qian SB(钱声帮)1; Liu L(刘亮)1; Kreiner, JM2; Qian, SB (reprint author), Chinese Acad Sci, United Lab Opt Astron, Beijing 100012, Peoples R China.
发表期刊NEW ASTRONOMY
2006-11
卷号12期号:2页码:117-123
DOI10.1016/j.newast.2006.07.003
产权排序第1完成单位
收录类别SCI ; EI
关键词Stars : Binaries : Close Stars : Binaries : Eclipsing Stars : Individual (Bh Cen) Stars : Individual (V701 Sco) Stars : Evolution Stars : Early Type
摘要Both V701 Sco and BH Cen are two early-type short-period overcontact systems (P = 0.(d)762 and p = 0.(d)792, respectively). V701 Sco is a member of the young galactic cluster NGC 6383, while BH Cen is a component of a younger galactic cluster IC 2944 where star formation is in process. They provide good opportunity to understand the formation and evolution of binary stars. In the present paper, orbital period changes of the two binaries are investigated. It is discovered that the orbital period of BH Cen shows a long-term increase with a rate of dP/dt = + 1.70(+/- 0.39) x 10(-7) days/year while it undergoes a cyclic oscillation with a period of 44.6 years and an amplitude of A 3 = 0.(d)0216. For V701 Sco, its O-C curve reveals a periodic change with a period of 41.2 years and amplitude of A(3) = 0.(d)0158. The mass ratio of BH Cen is 0.84, but V701 Sco contains twin B1-1.5V type stars with a mass ratio of unit. The continuous period increase of BH Cen is caused by the mass transfer from the less massive component to the more massive one at a rate of dM(2)/dt = 3.5 x 10(-6) days/year. The cyclic period changes of both systems can be plausibly explained as the results of light-travel time effects suggesting that they are triple systems. The astrophysical parameters of the unseen tertiary components in the two systems have been determined. We think that the invisible tertiary components in both binaries played an important role in the formations and evolutions of the overcontact configurations by bringing angular momentum out from the central systems. For BH Cen, this process created the initial short period and will support its evolution into an overcontact configuration via a Case A mass transfer within the life time of the extremely young cluster IC2944. For V701 Sco, two identical zero-age main-sequence components in an overcontact configuration suggest that it may have been formed by fission, possibly by the fission of the third body. The fact that no long-term continuous period variations were found for V701 Sco may suggest that an overcontact binary with the mass ratio of unity can be in an equilibrium revealing that the original configuration of the binary was overcontact as is its present state. It has been reported that faint stars in the two extremely young clusters are relatively scare. From the present study, it is shown that faint stars in young clusters are usually formed as companions of OB stars (including binaries). It is very difficult to detect them because of their low luminosity when compared with the more luminous OB stars. (c) 2006 Published by Elsevier B.V.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1384-1076
URL查看原文
归档日期2006-10-16
WOS记录号WOS:000241766200004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMAL RELAXATION OSCILLATION ; CONTACT BINARIES ; CLOSE BINARIES ; UBV PHOTOMETRY ; LIGHT-CURVE ; CENTAURI ; MODULATION ; SYSTEMS ; SCORPII ; LEONIS
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5785
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, United Lab Opt Astron, Beijing 100012, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan Province 650011, PR China
2.Mt. Suhora Observatory, Cracow Pedagogical University ul. Podchorazych 2 30-084 Krakow, Poland Received 14 May 2006, Revised 16 July 2006, Accepted 18 July 2006, Available online 7 August 2006
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Qian SB,Liu L,Kreiner, JM,et al. Orbital period investigations of two short-period early-type overcontact binaries BH Cen and V701 Sco in two extremely young galactic clusters IC 2944 and NGC 6383[J]. NEW ASTRONOMY,2006,12(2):117-123.
APA Qian SB,Liu L,Kreiner, JM,&Qian, SB .(2006).Orbital period investigations of two short-period early-type overcontact binaries BH Cen and V701 Sco in two extremely young galactic clusters IC 2944 and NGC 6383.NEW ASTRONOMY,12(2),117-123.
MLA Qian SB,et al."Orbital period investigations of two short-period early-type overcontact binaries BH Cen and V701 Sco in two extremely young galactic clusters IC 2944 and NGC 6383".NEW ASTRONOMY 12.2(2006):117-123.
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