| Testing three derivative methods of stellar population synthesis models | |
Zhang Y(张余)1,2,3 ; Han ZW(韩占文)1,3; Liu, JZ4; Zhang FH(张奉辉)1,3; Kang XY(康晓宇)1,2,3; Zhang, Y (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
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| 发表期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 2012-04 | |
| 卷号 | 421期号:2页码:1678-1696 |
| DOI | 10.1111/j.1365-2966.2012.20430.x |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Globular Clusters: General Galaxies: Fundamental Parameters Galaxies: Stellar Content |
| 摘要 | The number of methods used to study the properties of galaxies is increasing, and it is very important to test these methods. Galactic globular clusters (GCs) provide an excellent medium for such tests, because they can be considered as simple stellar populations. We present ages and metallicities for 40 Galactic GCs as determined from three publicly available techniques, namely the colour, Lick-index and spectrum-fitting methods, based on Bruzual & Charlot evolutionary population synthesis (EPS) models. By comparisons with the ages obtained from colour-magnitude diagrams (CMDs) and metallicities obtained from the spectra of stars, we are able to estimate the ability of these methods to determine GC parameters, which is essential. We find that: (i) for the metallicity, our derived metallicities agree with those derived from the spectra of stars - the Lick-index method is suitable for studying metallicity for stellar population systems in the range - 1.5 less than or similar to [Fe/H] less than or similar to -0.7 and the spectrum-fitting method is suitable for studying metallicity for stellar population systems in the range -2.3 less than or similar to [Fe/H] less than or similar to -1.5; (ii) for the age, these three methods have difficulties in age determination - our derived ages are smaller (by about 2.0 Gyr, on average) than the results of CMDs for all three methods. We use Vazdekis and Maraston models to analyse whether our results are dependent on EPS models, and find that the tendency of these two models is the same as that of Bruzual & Charlot models. Our results are independent of the EPS models. In addition, our test is based on old GCs and our conclusions may hold for old stellar population systems. Besides the age-metallicity degeneracy, we examine the possible effects of other factors (horizontal branch morphology, blue straggler stars, binary interactions and alpha-enhancement) and give a quantitative analysis of the influences of these factors on age determinations (except for alpha-enhancement). For the colour and spectrum-fitting methods, the age can be underestimated by about 0.0-3.0, 0.0-2.0 and 0.0-3.0Gyr owing to the influence of horizontal branch, blue straggler and binary stars, respectively. For the Lick-index method, the lower limit of maximal change of age is 6.0, 5.0 and 3.0 Gyr owing to the influence of horizontal branch, blue straggler and binary stars, respectively. |
| 项目资助者 | Natural Science Foundation [10773026, 11033008, 10821061, 2007CB815406, 11103054] ; Chinese Academy of Sciences [KJCX2-YW-T24] ; program 'Light in China, Western Region' (LCWR) [XBBS201022] ; program 'Beyond the Horizons' [100020101] ; Xinjiang Natural Science Foundation [2011211A104] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0035-8711 |
| URL | 查看原文 |
| 归档日期 | 2012-03-20 |
| WOS记录号 | WOS:000302695600060 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | GALACTIC GLOBULAR-CLUSTERS ; HIGH-SPECTRAL-RESOLUTION ; EARLY-TYPE GALAXIES ; HORIZONTAL-BRANCH STARS ; SPACE-TELESCOPE OBSERVATIONS ; ELEMENT ABUNDANCE RATIOS ; LARGE-MAGELLANIC-CLOUD ; INITIAL MASS FUNCTION ; BLUE STRAGGLER STARS ; SUBDWARF-B-STARS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4540 |
| 专题 | 大样本恒星演化研究组 中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Zhang, Y (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, 650011, China 2.Graduate University of Chinese Academy of Sciences, Beijing, 100049, China 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China 4.National Astronomical Observatories/Xinjiang Observatory, Chinese Academy of Sciences, Urumqi, 830011, China |
| 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 | Zhang Y,Han ZW,Liu, JZ,et al. Testing three derivative methods of stellar population synthesis models[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,421(2):1678-1696. |
| APA | Zhang Y,Han ZW,Liu, JZ,Zhang FH,Kang XY,&Zhang, Y .(2012).Testing three derivative methods of stellar population synthesis models.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,421(2),1678-1696. |
| MLA | Zhang Y,et al."Testing three derivative methods of stellar population synthesis models".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 421.2(2012):1678-1696. |
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| Testing three deriva（5100KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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