THREE CLOSE BINARIES IN DIFFERENT EVOLUTIONARY STAGES IN THE OLD OPEN CLUSTER NGC 188
文献类型：期刊论文
| 作者 | Zhu LY(朱俐颖)1,2,3 ; Qian SB(钱声帮)1,2,3; Soonthornthum, B4; Liu L(刘亮)1,2; He JJ(何家佳)1,2; Liu NP(刘念平)1,2,3; Zhao EG(赵二刚)1,2,3; Zhang J(张嘉)1,2,3; Wang JJ(王晶晶)1,2,3
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2014-02 |
| 卷号 | 147期号:2 |
| 关键词 | binaries: close binaries: eclipsing stars: evolution stars: individual (EP Cep, ES Cep, V369 Cep) |
| ISSN号 | 0004-6256 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Zhu, LY (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | NGC 188 is a good laboratory for studying the formation and evolution of W UMa type contact binaries due to its rich populations of them. We present a detailed photometric study of three short-period close binaries, EP Cep, ES Cep, and V369 Cep, in the old open cluster NGC 188 based on our two-set photometric observations. We discovered that both EP Cep and ES Cep are shallow-contact binaries with continuously decreasing periods. The difference is in their mass ratios. EP Cep has an extremely low-mass ratio, q = 0.15, while ES Cep has a relatively high-mass ratio, q = 0.69, indicating that they lie in different evolutionary stages. ES Cep is likely a newly formed contact binary via a Case A mass transfer, while EP Cep is an evolved system and may be on the oscillations caused by the combined effect of the thermal relaxation oscillation and the variable angular momentum loss. For another system, V369 Cep, we found that it is a primary-filling near-contact binary. Both the semidetached configuration and the continuous decrease in the orbital period indicate that it is undergoing a mass transfer from the primary component to the secondary one. This conclusion is in agreement with the excess luminosity seen in the light curves on the ingress of the secondary minimum produced by the impact of the mass transfer. All of the results suggest that V369 Cep is evolving into contact, and a shallow-contact high-mass ratio system similar to ES Cep will be formed. Then, it will evolve into a low-mass ratio contact binary just like EP Cep, and finally merge into a rapidly rotating single star. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | THERMAL RELAXATION OSCILLATION ; CONTACT BINARIES ; VARIABLE-STARS ; LIGHT CURVES ; NGC-188 ; AGE ; SYSTEMS ; FIELD |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/0004-6256/147/2/42/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000329837100018 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5908]  |
| 专题 | 云南天文台_双星与变星研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China 2.Key Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China 3.Physical Sciences Department, Graduate University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing, China 4.National Astronomical Research Institute of Thailand/Ministry of Science and Technology, Bangkok, Thailand |
| 推荐引用方式 GB/T 7714 | Zhu LY,Qian SB,Soonthornthum, B,et al. THREE CLOSE BINARIES IN DIFFERENT EVOLUTIONARY STAGES IN THE OLD OPEN CLUSTER NGC 188[J]. ASTRONOMICAL JOURNAL,2014,147(2). |
| APA | Zhu LY.,Qian SB.,Soonthornthum, B.,Liu L.,He JJ.,...&Wang JJ.(2014).THREE CLOSE BINARIES IN DIFFERENT EVOLUTIONARY STAGES IN THE OLD OPEN CLUSTER NGC 188.ASTRONOMICAL JOURNAL,147(2). |
| MLA | Zhu LY,et al."THREE CLOSE BINARIES IN DIFFERENT EVOLUTIONARY STAGES IN THE OLD OPEN CLUSTER NGC 188".ASTRONOMICAL JOURNAL 147.2(2014). |
入库方式： OAI收割
来源：云南天文台
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