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Effect of dynamical interactions on integrated properties of globular clusters

文献类型：期刊论文

作者Zhuang YL(庄宇龙)1,2,3; Zhang FH(张奉辉)1,3; Anders, P4; Ruan ZF(阮志锋)1,2,3; Cheng LT(程连涛)1,2,3; Kang XY(康晓宇)1,2,3
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2015-02
卷号446期号:4页码:4260-4270
关键词methods: numerical stars: luminosity function, mass function stars: mass-loss globular clusters: general galaxies: star clusters: general
ISSN号0035-8711
产权排序第一完成单位
通讯作者Zhuang, YL (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China.
英文摘要Globular clusters (GCs) are generally treated as natural validators of simple stellar population (SSP) models. However, there are still some differences between real GCs and SSPs. In this work, we use a direct N-body simulation code NBODY6 to study the influences of dynamical interactions, metallicity and primordial binaries on Milky Way GCs' integrated properties. Our models start with N = 100 000 stars, covering a metallicity range Z = 0.0001 similar to 0.02, a subset of our models contain primordial binaries, resulting in a binary fraction as currently observed at a model age of GCs. Stellar evolution and external tidal field representative for an average Milky Way GC are taken into consideration. The integrated colours and Lick indices are calculated using BaSeL and Bluered stellar spectral libraries separately. By including dynamical interactions, our model clusters show integrated features (i.e. colours up to 0.01 mag bluer, H beta up to 0.1 angstrom greater and [MgFe]' 0.05 angstrom smaller) making the clusters appear slightly younger than the model clusters without dynamical interactions. This effect is caused mainly by the preferential loss of low-mass stars which have a stronger contribution to redder passbands as well as different spectral features compared to higher mass stars. In addition, this effect is larger at lower metallicities. On the contrary, the incorporation of primordial binaries reduces this effect.
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]ABSORPTION-FEATURE INDEXES ; HIGH-SPECTRAL-RESOLUTION ; HORIZONTAL-BRANCH STARS ; OLD STELLAR POPULATIONS ; EVOLUTIONARY SYNTHESIS ; PHOTOMETRIC EVOLUTION ; MASS-DISTRIBUTION ; SYNTHESIS MODELS ; GAS EXPULSION ; HALO
收录类别SCI
原文出处http://mnras.oxfordjournals.org/content/446/4/4260
语种英语
WOS记录号WOS:000350272400080
源URL[http://ir.ynao.ac.cn/handle/114a53/4602]  
专题云南天文台_大样本恒星演化研究组
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, Kunming 650011, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Key Laboratory of Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
4.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
推荐引用方式
GB/T 7714		 Zhuang YL,Zhang FH,Anders, P,et al. Effect of dynamical interactions on integrated properties of globular clusters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,446(4):4260-4270.
APA Zhuang YL,Zhang FH,Anders, P,Ruan ZF,Cheng LT,&Kang XY.(2015).Effect of dynamical interactions on integrated properties of globular clusters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,446(4),4260-4270.
MLA Zhuang YL,et al."Effect of dynamical interactions on integrated properties of globular clusters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 446.4(2015):4260-4270.

入库方式： OAI收割

来源：云南天文台

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