| How young stellar populations affect the ages and metallicities of galaxies | |
Li ZM(李忠木) ; Han ZW(韩占文); Li, Z (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, AH-650011 Kunming, Peoples R China.
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| 发表期刊 | ASTRONOMY & ASTROPHYSICS
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| 2007-09 | |
| 卷号 | 471期号:3页码:795-804 |
| DOI | 10.1051/0004-6361:20077242 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI ; EI |
| 关键词 | Galaxies : Stellar Content Galaxies : Photometry Galaxies : Elliptical And Lenticular Cd |
| 摘要 | Context. Two important stellar-population parameters (age and metallicity) of the dominant stellar populations (DSPs) of galaxies are usually estimated by comparing the observed absorption line indices or colors to predictions of some simple stellar population models. However, some studies show that there is actually recent star formation in galaxies, including early type ones. This suggests that we may not be obtaining accurate the two stellar-population parameters for the DSPs of galaxies. This is obvious when we estimate the two parameters by colors, because the youngest populations dominate the light and make the fitted stellar populations younger and richer in metal. Aims. We plan to study how young populations (YSPs) in composite stellar populations (CSPs) affect the colors of star systems and to analyze how the stellar ages and metallicities derived from colors possibly deviate from those of the DSPs. Methods. The techniques of stellar population synthesis and Monte Carlo process are used in this analysis. Results. It is found that the age and mass fraction of a YSP affect colors of a mixed star system significantly, but the former is stronger. In addition, our results show that the stellar ages and metallicities derived directly from a pair of colors are about 2.14 Gyr younger, while 0.0027 more metal rich on average than those of the DSPs of composite stellar systems. Some possible distributions of the differences between stellar-population parameters determined by colors and those of DSPs of CSPs are presented. The possible distributions of the differences between colors of CSPs and those of their DSPs are also shown. Stellar ages and metallicities measured by colors and line-strength indices are compared in the work, with a sample of 18 galaxies. Furthermore, the YSPs may affect the fundamental plane and Kormendy relation of early type galaxies. |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-6361 |
| URL | 查看原文 |
| 归档日期 | 2007-12-05 |
| WOS记录号 | WOS:000248682800011 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | BLUE COMPACT GALAXIES ; FUNDAMENTAL PLANE ; SPECTRAL-RESOLUTION ; LENTICULAR GALAXIES ; ELLIPTIC GALAXIES ; COLORS ; DISTRIBUTIONS ; PARAMETERS ; HISTORIES ; GRADIENTS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4437 |
| 专题 | 大样本恒星演化研究组 |
| 通讯作者 | Li, Z (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, AH-650011 Kunming, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Li ZM,Han ZW,Li, Z . How young stellar populations affect the ages and metallicities of galaxies[J]. ASTRONOMY & ASTROPHYSICS,2007,471(3):795-804. |
| APA | 李忠木,韩占文,&Li, Z .(2007).How young stellar populations affect the ages and metallicities of galaxies.ASTRONOMY & ASTROPHYSICS,471(3),795-804. |
| MLA | 李忠木,et al."How young stellar populations affect the ages and metallicities of galaxies".ASTRONOMY & ASTROPHYSICS 471.3(2007):795-804. |
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| How young stellar po（971KB） | 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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