PHYSICAL PARAMETER STUDY OF EIGHT W URSAE MAJORIS-TYPE CONTACT BINARIES IN NGC 188
文献类型：期刊论文
| 作者 | Chen, Xiaodian1,2,3; Deng, Licai3 ; De Grijs, Richard1,2,4; Zhang, Xiaobin3; Xin, Yu3; Wang, Kun3,5; Luo, Changqing3; Yan, Zhengzhou3,5; Tian, Jianfeng3; Sun, Jinjiang6
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2016-11-01 |
| 卷号 | 152期号:5 |
| 关键词 | binaries: eclipsing methods: data analysis open clusters and associations: individual (NGC 188, Berkeley 39) stars: distances |
| 英文摘要 | We used the newly commissioned 50 cm Binocular Network telescope at Qinghai Station of Purple Mountain Observatory (Chinese Academy of Sciences) to observe the old open cluster NGC 188 in V and R as part of a search for variable objects. Our time-series data span a total of 36 days. Radial velocity and proper-motion selection resulted in a sample of 532 genuine cluster members. Isochrone fitting was applied to the cleaned cluster sequence, yielding a distance modulus of (m - M)(V)(0) = 11.35 +/- 0.10 mag and a total foreground reddening of E(V - R) = 0.062 +/- 0.002 mag. Light-curve solutions were obtained for eight W Ursae Majoris eclipsing. binary systems (W UMas), and their orbital parameters were estimated. Using the latter parameters, we estimate a distance to the W UMas that is independent of the host cluster's physical properties. Based on combined fits to six of the W UMas (EP Cep, EQ Cep, ES Cep, V369 Cep, and-for the first time-V370 Cep and V782 Cep), we obtain an average distance modulus of (m - M)(V)(0) = 11.31 +/- 0.08 mag, which is comparable to. that resulting from our isochrone fits. These six W UMas exhibit an obvious period-luminosity relation. We derive more accurate physical parameters for the W UMa systems and discuss their initial masses and ages. The former show that these W UMa systems have likely undergone angular. momentum evolution within a convective envelope (W-type evolution). The ages of the W UMa systems agree well with the cluster's age. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | WIYN OPEN CLUSTER ; OLD OPEN CLUSTERS ; VARIABLE-STARS ; LUMINOSITY-RELATION ; ECLIPSING BINARIES ; CCD PHOTOMETRY ; LIGHT CURVES ; BERKELEY 39 ; NGC-188 ; EVOLUTION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000403827800005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8829]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Lu 5, Beijing 100871, Peoples R China 2.Peking Univ, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China 4.Int Space Sci Inst Beijing, 1 Nanertiao, Beijing 100190, Peoples R China 5.China West Normal Univ, Sch Phys & Elect Informat, Nanchong 637002, Peoples R China 6.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Xiaodian,Deng, Licai,De Grijs, Richard,et al. PHYSICAL PARAMETER STUDY OF EIGHT W URSAE MAJORIS-TYPE CONTACT BINARIES IN NGC 188[J]. ASTRONOMICAL JOURNAL,2016,152(5). |
| APA | Chen, Xiaodian.,Deng, Licai.,De Grijs, Richard.,Zhang, Xiaobin.,Xin, Yu.,...&Yan,Zhengzhou.(2016).PHYSICAL PARAMETER STUDY OF EIGHT W URSAE MAJORIS-TYPE CONTACT BINARIES IN NGC 188.ASTRONOMICAL JOURNAL,152(5). |
| MLA | Chen, Xiaodian,et al."PHYSICAL PARAMETER STUDY OF EIGHT W URSAE MAJORIS-TYPE CONTACT BINARIES IN NGC 188".ASTRONOMICAL JOURNAL 152.5(2016). |
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来源：国家天文台
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