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A possible relation between the period change and the mass ratio for W-type contact binaries
Qian SB(钱声帮)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2001-12-01
卷号328期号:2页码:635-644
DOI10.1046/j.1365-8711.2001.04931.x
产权排序第1完成单位
收录类别SCI
关键词Binaries : Close Stars : Evolution Stars : General
摘要Orbital period changes of eight W-type contact binaries (TY Boo, BH Cas, AD Cnc, TX Cnc, RZ Com, LS Del, BB Peg and AA UMa) are presented based on the analysis of their O-C curves. It is found that the periods of the five systems TY Boo, TX Cnc, RZ Com, LS Del and AA UMa show secular increase. For BB Peg, its period increase rate has been revised. For AD Cnc, weak evidence also shows that its orbital period is increasing. For the remaining BH Cas, the three times of light minimum given by Agerer & Hubscher indicate that, recently, its period has been increasing. However, the properties of the period need further study. The mass ratios of all the systems are larger than 0.4. The period increases of the systems may suggest that the W-type W UMa stars with high mass ratio (q > 0.4) usually show their period increase. In order to check this conclusion, secular period changes of 30 W-type contact binaries have been collected from the literature. It is found that systems showing period increase usually have a higher mass ratio (q > 0.4), and the periods of low-mass ratio systems (q < 0.4) are varying in a secular decrease. This strongly suggests that a relation between the orbital period variation and the mass ratio for W-type contact binaries may exist. If the secular period change is caused by conservative mass transfer between the components, this relation may suggest that the evolution of the W-type systems is oscillation around a critical mass ratio (q 0.4). However this is highly speculative. On the other hand, the relation may be potentially strong observational evidence for Rahunen's conclusion that angular momentum loss (AML) may enable the components of a contact binary to remain in good contact throughout the thermal relaxation oscillation (TRO) cycle. This connection could be explained by the combination of the TRO and the variable AML via the change of depth of contact, which needs further studies observationally and theoretically.
语种英语
学科领域Astronomy & Astrophysics
文章类型Review
ISSN0035-8711
URL查看原文
归档日期2002-01-07
WOS记录号WOS:000172925500026
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ANGULAR-MOMENTUM LOSS ; LIGHT CURVES ; UMA-TYPE ; ECLIPSING BINARIES ; ORBITAL PERIOD ; CK-BOOTIS ; STARS ; EVOLUTION ; SYSTEMS ; CANCRI
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5746
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China
2.National Astronomical Observatories, Chinese Academy of Sciences (NAOCAS), 100012 Beijing, China
3.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, China
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Qian SB,Qian, SB . A possible relation between the period change and the mass ratio for W-type contact binaries[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2001,328(2):635-644.
APA Qian SB,&Qian, SB .(2001).A possible relation between the period change and the mass ratio for W-type contact binaries.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,328(2),635-644.
MLA Qian SB,et al."A possible relation between the period change and the mass ratio for W-type contact binaries".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 328.2(2001):635-644.
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