Simple stellar population models as probed by the Large Magellanic Cloud star cluster ESO 121-SC03
文献类型：期刊论文
| 作者 | Xin Y(新宇)1,2,3 ; Deng, L2; de Grijs, R1,2; Mackey, AD4; Han ZW(韩占文)3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2008-02-11 |
| 卷号 | 384期号:1页码:410-419 |
| ISSN号 | 0035-8711 |
| 关键词 | blue stragglers globular clusters : individual : ESO 121-SC03 Magellanic Clouds galaxies : star clusters |
| 通讯作者 | Xin, Y (reprint author), Univ Sheffield, Dept Phys & Astron, Hicks Bldg,Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England. |
| 产权排序 | 第三完成单位 |
| 英文摘要 | The presence of blue straggler stars (BSs) in star clusters has proven a challenge to conventional simple stellar population (SSP) models. Conventional SSP models are based on the evolution theory of single stars. Meanwhile, the typical locations of BSs in the colour-magnitude diagram of a cluster are brighter and bluer than the main-sequence turn-off point. Such loci cannot be predicted by single-star evolution theory. However, stars with such properties contribute significantly to the integrated light of the cluster. In this paper, we reconstruct the integrated properties of the Large Magellanic Cloud cluster European Southern Observatory (ESO) 121-SC03, the only cluster populating the well-known age gap in the cluster age distribution, based on a detailed exploration of the individual cluster stars, and with particular emphasis on the cluster's BSs. We find that the integrated light properties of ESO 121-SC03 are dramatically modified by its BS component. The integrated spectral energy distribution (ISED) flux level is significantly enhanced towards shorter wavelengths, and all broad-band colours become bluer. When fitting the fully integrated ISED of this cluster based on conventional SSP models, the best-fitting values of age and metallicity are significantly underestimated compared to the true cluster parameters. The age underestimate is similar to 40 per cent if we only include the BSs within the cluster's half-light radius and similar to 60 per cent if all BSs are included. The corresponding underestimates of the cluster's metallicity are similar to 30 and similar to 60 per cent, respectively. The populous star clusters in the Magellanic Clouds are ideal objects to explore the potential importance of BSs for the integrated light properties of more distant unresolved star clusters in a statistically robust manner, since they cover a large range in age and metallicity. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | BLUE STRAGGLER STARS ; 3-DIMENSIONAL HYDRODYNAMICAL SIMULATIONS ; SURFACE BRIGHTNESS PROFILES ; GALACTIC GLOBULAR-CLUSTERS ; MAIN-SEQUENCE STARS ; ADVANCED CAMERA ; STRUCTURAL PARAMETERS ; CCD PHOTOMETRY ; MASS-TRANSFER ; COLLISIONS |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/384/1/410 |
| 语种 | 英语 |
| WOS记录号 | WOS:000253312300031 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4460]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 作者单位 | 1.Department of Physics and Astronomy, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH 2.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan 650011, China 4.Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ |
| 推荐引用方式 GB/T 7714 | Xin Y,Deng, L,de Grijs, R,et al. Simple stellar population models as probed by the Large Magellanic Cloud star cluster ESO 121-SC03[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,384(1):410-419. |
| APA | Xin Y,Deng, L,de Grijs, R,Mackey, AD,&Han ZW.(2008).Simple stellar population models as probed by the Large Magellanic Cloud star cluster ESO 121-SC03.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,384(1),410-419. |
| MLA | Xin Y,et al."Simple stellar population models as probed by the Large Magellanic Cloud star cluster ESO 121-SC03".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 384.1(2008):410-419. |
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来源：云南天文台
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