A search for strongly Mg-enhanced stars from the Sloan Digital Sky Survey
文献类型：期刊论文
| 作者 | Li, Xiang1,2 ; Zhao, Gang1; Chen, Yu-Qin1; Li, Hai-Ning1; Zhao Gang; Li Xiang; Li Haining; Chen Yuqin
|
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2014-11-01 |
| 卷号 | 14期号:11页码:1423-1437 |
| 关键词 | stars: abundance stars: chemically peculiar method: data analysis techniques: spectroscopic analysis |
| 英文摘要 | Strongly Mg-enhanced stars with [Mg/Fe] > 1.0 show peculiar abundance patterns and hence are of great interest for our understanding of stellar formation and chemical evolution of the Galaxy. A systematic search for strongly Mg-enhanced stars based on low-resolution (R similar or equal to 2000) spectra from the Sloan Digital Sky Survey (SDSS) is carried out by finding the synthetic spectrum that best matches the observed one in the region of Mg I b lines around lambda 5170 angstrom via a profile matching method. The advantage of our method is that fitting parameters are refined by reproducing the [Mg/Fe] ratios of 47 stars from the very precise high-resolution spectroscopic (HRS) analysis by Nissen & Schuster; and these parameters are crucial to the precision and validity of the derived Mg abundances. As a further check of our method, Mg abundances are estimated with our method for member stars in four Galactic globular clusters (M92, M13, M3, M71) which cover the same metallicity range as our sample, and the results are in good agreement with those of HRS analysis in the literature. The validation of our method is also demonstrated by the agreement of [Mg/Fe] between our values and those of HRS analysis by Aoki et al. Finally, 33 candidates of strongly Mg-enhanced stars with [Mg/Fe] > 1.0 are selected from 14 850 F and G stars. Follow-up observations will be carried out on these candidates with high-resolution spectroscopy by large telescopes in the near future, so as to check our selection procedure and to perform a precise and detailed abundance analysis and to explore the origins of these stars. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000344601200006 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6521]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Xiang,Zhao, Gang,Chen, Yu-Qin,et al. A search for strongly Mg-enhanced stars from the Sloan Digital Sky Survey[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2014,14(11):1423-1437. |
| APA | Li, Xiang.,Zhao, Gang.,Chen, Yu-Qin.,Li, Hai-Ning.,Zhao Gang.,...&Chen Yuqin.(2014).A search for strongly Mg-enhanced stars from the Sloan Digital Sky Survey.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,14(11),1423-1437. |
| MLA | Li, Xiang,et al."A search for strongly Mg-enhanced stars from the Sloan Digital Sky Survey".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 14.11(2014):1423-1437. |
入库方式： OAI收割
来源：国家天文台
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