ELM: AN ALGORITHM TO ESTIMATE THE ALPHA ABUNDANCE FROM LOW-RESOLUTION SPECTRA
文献类型：期刊论文
| 作者 | Bu, Yude1; Zhao, Gang2 ; Pan, Jingchang3; Kumar, Yerra Bharat2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2016-01-20 |
| 卷号 | 817期号:1 |
| 关键词 | methods: data analysis methods: statistical stars: abundances |
| 英文摘要 | We have investigated a novel methodology using the extreme learning machine (ELM) algorithm to determine the a abundance of stars. Applying two methods based on the ELM algorithm-ELM+spectra and ELM+Lick indices-to the stellar spectra from the ELODIE database, we measured the a abundance with a precision better than 0.065 dex. By applying these two methods to the spectra with different signal-to-noise ratios (S/Ns) and different resolutions, we found that ELM+spectra is more robust against degraded resolution and ELM+Lick indices is more robust against. variation in S/N. To further validate the performance of ELM, we applied ELM+spectra and ELM+Lick indices to SDSS spectra and estimated a abundances with a precision around 0.10 dex, which is comparable to the results given by the SEGUE Stellar Parameter Pipeline. We further applied ELM to the spectra of stars in Galactic globular clusters (M15, M13, M71) and open clusters (NGC 2420, M67, NGC 6791), and results show good agreement with previous studies (within 1s). A comparison of the ELM with other widely used methods including support vector machine, Gaussian process regression, artificial neural networks, and linear least-squares regression shows that ELM is efficient with computational resources and more accurate than other methods. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000368872400078 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5429]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Shandong Univ, Sch Math & Stat, Weihai 264209, Shandong, Peoples R China 2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 3.Shandong Univ, Sch Mech Elect & Informat Engn, Weihai 264209, Shandong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bu, Yude,Zhao, Gang,Pan, Jingchang,et al. ELM: AN ALGORITHM TO ESTIMATE THE ALPHA ABUNDANCE FROM LOW-RESOLUTION SPECTRA[J]. ASTROPHYSICAL JOURNAL,2016,817(1). |
| APA | Bu, Yude,Zhao, Gang,Pan, Jingchang,&Kumar, Yerra Bharat.(2016).ELM: AN ALGORITHM TO ESTIMATE THE ALPHA ABUNDANCE FROM LOW-RESOLUTION SPECTRA.ASTROPHYSICAL JOURNAL,817(1). |
| MLA | Bu, Yude,et al."ELM: AN ALGORITHM TO ESTIMATE THE ALPHA ABUNDANCE FROM LOW-RESOLUTION SPECTRA".ASTROPHYSICAL JOURNAL 817.1(2016). |
入库方式： OAI收割
来源：国家天文台
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