Simple stellar population models as probed by the Large Magellanic Cloud star cluster ESO 121-SC03

doi:10.1111/j.1365-2966.2007.12720.x

YNAO OpenIR > 大样本恒星演化研究组

	Simple stellar population models as probed by the Large Magellanic Cloud star cluster ESO 121-SC03
	Xin Y(新宇)1,2,3 ; Deng, L 2; de Grijs, R 1,2; Mackey, AD 4; Han ZW(韩占文)3 ; Xin, Y (reprint author), Univ Sheffield, Dept Phys & Astron, Hicks Bldg,Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England.
发表期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2008-02-11
卷号	384 期号:1 页码:410-419
DOI	10.1111/j.1365-2966.2007.12720.x
产权排序	第3完成单位
收录类别	SCI
关键词	Blue Stragglers Globular Clusters : Individual : Eso 121-sc03 Magellanic Clouds Galaxies : Star Clusters
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.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0035-8711
URL	查看原文
WOS记录号	WOS:000253312300031
WOS研究方向	Astronomy & Astrophysics
WOS类目	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
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4460
专题	大样本恒星演化研究组
通讯作者	Xin, Y (reprint author), Univ Sheffield, Dept Phys & Astron, Hicks Bldg,Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England.
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
第一作者单位	中国科学院云南天文台
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,&Xin, Y .(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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