Exploring the spectral information content in the LAMOST medium-resolution survey (MRS)
文献类型：期刊论文
| 作者 | Zhang Bo1,2; Liu Chao1,2; Li Chun-Qian1,2; Deng Li-Cai2; Yan Tai-Sheng2; Shi Jian-Rong2 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2020-04-01 |
| 卷号 | 20期号:4页码:12 |
| 关键词 | methods data analysis methods statistical stars fundamental parameters stars abundances |
| ISSN号 | 1674-4527 |
| DOI | 10.1088/1674-4527/20/4/51 |
| 英文摘要 | Although high-resolution stellar spectra allow us to derive precise stellar labels (effective temperature, metallicity, surface gravity, elemental abundances, etc.) based on resolved atomic lines and molecular bands, low-resolution spectra have been proved to be competitive in determiningmany stellar labels at comparable precision. It is useful to consider the spectral information content when assessing the capability of a stellar spectrum in deriving precise stellar labels. In this work, we quantify the information content brought by the LAMOST-II medium-resolution spectroscopic survey (MRS) using the gradient spectra as well as the coefficients-of-dependence (CODs). In general, the wavelength coverage of the MRS well constrains the stellar labels but the sensitivities of different stellar labels vary with spectral types and metallicity of the stars of interest. Consequently, this affects the performance of the stellar label determination from the MRS spectra. By applying the SLAM method to the synthetic spectra which mimic the MRS data, we find that the precision of the fundamental stellar parameters T-eff, log g and [M/H] are better when combining both the blue and red bands of the MRS. This is especially important for warm stars because the H alpha line located in the red part plays a more important role in determining the effective temperature for warm stars. With blue and red parts together, we are able to reach similar performance to the low-resolution spectra except for warm stars. However, at [M/H] similar to -2.0 dex, the uncertainties of fundamental stellar labels estimated from MRS are substantially larger than that from low-resolution spectra. We also tested the uncertainties of T-eff, log g and [M/H] From MRS data induced from the radial velocity mismatch and find that a mismatch of about 1 km s(-1), which is typical for LAMOST MRS data, would not significantly affect the stellar label estimates. Finally, reference precision limits are calculated using synthetic gradient spectra, according to which we expect abundances of at least 17 elements to be measured precisely from MRS spectra. |
| WOS关键词 | SEGUE ; STARS |
| 资助项目 | National Key R&D Program of China[2019YFA0405501] ; National Natural Science Foundation of China[11835057] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000529929400001 |
| 出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
| 资助机构 | National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/55145]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Zhang Bo |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang Bo,Liu Chao,Li Chun-Qian,et al. Exploring the spectral information content in the LAMOST medium-resolution survey (MRS)[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2020,20(4):12. |
| APA | Zhang Bo,Liu Chao,Li Chun-Qian,Deng Li-Cai,Yan Tai-Sheng,&Shi Jian-Rong.(2020).Exploring the spectral information content in the LAMOST medium-resolution survey (MRS).RESEARCH IN ASTRONOMY AND ASTROPHYSICS,20(4),12. |
| MLA | Zhang Bo,et al."Exploring the spectral information content in the LAMOST medium-resolution survey (MRS)".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 20.4(2020):12. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。