Effects of Spectral Resolution and Noise on the Measurement of Indices
文献类型：期刊论文
| 作者 | Du Wei1,2,3; Luo A-li1,2 ; Zhao Yong-heng1,2
|
| 刊名 | SPECTROSCOPY AND SPECTRAL ANALYSIS
 |
| 出版日期 | 2012-07-01 |
| 卷号 | 32期号:7页码:1886-1890 |
| 关键词 | Spectral line index Spectral resolution Signal-to-noise ratio Measuremental accuracy Statistic |
| 英文摘要 | In the present paper, we analysed the effects of spectral resolutions and signal-to-noise ratios (SNRs) on 19 atomic absorption line indices of Lick index system. First of all, adopting method of convolving a spectrum with a Gaussian profile, we transformed spectra into those under different resolutions and then measured the line indices on them. Comparisons of the indices under various resolutions allow to investigate the impact of spectral resolution change on the accuracy of measurements of indices. Secondly, by adding random noises with different Gaussian distribution to a spectrum, the authors transformed theoretical spectra with no noises into those under diverse SNRs and then measured line indices on them. Comparisons of the indices under different SNRs greatly helped analyse the influence of SNR on the precision of the measurements of line indices. It comes from comparisons and analysis that the spectral resolution change can cause an index measurement change depending on the extent of the change of spectral resolution. Such a kind of change relationship varies with the indices. The lower the SNR, the less precise the measurements of indices. The effect of SNR on the measurements of indices can be ignored if SNR is larger than 25. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000307429700034 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6243]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci NAOC, Natl Astron Observ, Beijing 100012, Peoples R China 2.NAOC, Key Lab Opt Astron, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Du Wei,Luo A-li,Zhao Yong-heng. Effects of Spectral Resolution and Noise on the Measurement of Indices[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2012,32(7):1886-1890. |
| APA | Du Wei,Luo A-li,&Zhao Yong-heng.(2012).Effects of Spectral Resolution and Noise on the Measurement of Indices.SPECTROSCOPY AND SPECTRAL ANALYSIS,32(7),1886-1890. |
| MLA | Du Wei,et al."Effects of Spectral Resolution and Noise on the Measurement of Indices".SPECTROSCOPY AND SPECTRAL ANALYSIS 32.7(2012):1886-1890. |
入库方式： OAI收割
来源：国家天文台
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