BATC 13 band photometry of the open cluster NGC 7789
文献类型：期刊论文
| 作者 | Wu, Zhen-Yu ; Zhou, Xu; Ma, Jun; Jiang, Zhao-Ji; Chen, Jian-Sheng; Wu, Jiang-Hua
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| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2007-05-01 |
| 卷号 | 133期号:5页码:2061-2071 |
| 关键词 | open clusters and associations : individual (NGC 7789) stars : fundamental parameters stars : luminosity function, mass function |
| 英文摘要 | We present 13 band CCD intermediate-band spectrophotometry of a field centered on the open cluster NGC 7789 from 400 to nearly 1000 nm, taken with the Beijing-Arizona-Taiwan-Connecticut (BATC) Multi-Color Survey photometric system. By comparing observed spectral energy distributions of NGC 7789 stars with theoretical ones, the fundamental parameters of this cluster are derived: an age of 1.4 +/- 0.1 Gyr, a distance modulus (m - M)(0) = 11.27 +/- 0.04, a reddening E(B - V) 0.28 +/- 0.02, and a metallicity with the solar composition Z = 0.019. When the surface density profile for member stars with limiting magnitudes of 19.0 in the BATC e band (lambda(eff) = 4925 angstrom) is fitted by a King model, a core radius R-c = 7.52' and a tidal radius R-t = 28.84' are derived for NGC 7789. The observed mass function (MF) for main-sequence (MS) stars of NGC 7789 with masses from 0.95 to 1.85 M-circle dot is fitted with a power-law function empty set(m) alpha m(alpha), and a slope alpha = 0.96 is derived. Strong mass segregation in NGC 7789 is reflected in the significant variation of the concentration parameters C-0 = log (R-t/R-c) for member stars of NGC 7789 within different mass ranges: C-0 = 1.02 for the most massive stars and C-0 = 0.37 for the lowest mass MS stars. Strong mass segregation in NGC 7789 is also indicated in the significant variation of the slopes alpha in different spatial regions of the cluster: the MF for stars within the core region has alpha = -0.71, much flatter than that for stars in external regions of the cluster (alpha = -1.20). |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000246342200022 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7246]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Zhen-Yu,Zhou, Xu,Ma, Jun,et al. BATC 13 band photometry of the open cluster NGC 7789[J]. ASTRONOMICAL JOURNAL,2007,133(5):2061-2071. |
| APA | Wu, Zhen-Yu,Zhou, Xu,Ma, Jun,Jiang, Zhao-Ji,Chen, Jian-Sheng,&Wu, Jiang-Hua.(2007).BATC 13 band photometry of the open cluster NGC 7789.ASTRONOMICAL JOURNAL,133(5),2061-2071. |
| MLA | Wu, Zhen-Yu,et al."BATC 13 band photometry of the open cluster NGC 7789".ASTRONOMICAL JOURNAL 133.5(2007):2061-2071. |
入库方式： OAI收割
来源：国家天文台
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