| Automatic Normalization and Equivalent-Width Measurement of High-Resolution Stellar Spectra |
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| 引用本文： | Jing-Kun Zhao,Gang Zhao,Yu-Qin Chen,Jian-Rong Shi,Yu-Juan Liu and Ju-Yong Zhang National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012. Automatic Normalization and Equivalent-Width Measurement of High-Resolution Stellar Spectra[J]. 中国天文和天体物理学报, 2006, 6(6): 689-696 |
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| 作者姓名： | Jing-Kun Zhao Gang Zhao Yu-Qin Chen Jian-Rong Shi Yu-Juan Liu and Ju-Yong Zhang National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 |
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| 作者单位： | Jing-Kun Zhao，Gang Zhao，Yu-Qin Chen，Jian-Rong Shi，Yu-Juan Liu and Ju-Yong Zhang National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 |
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| 基金项目： | Supported by the National Natural Science Foundation of China. |
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| 摘 要： | It is well known that normalization, radial velocity correction and equivalent-width measurement of high-resolution stellar spectra are time-consuming work. In order to improve the efficiency we present an automatic method for these routines. The continuum is determined by fitting the 'high points' in the spectrum. After continuum normalization, the program automatically searches for the position of the Ha line and obtains a rough radial velocity, then computes an accurate radial velocity by cross-correlation between the given spectrum and the solar spectrum. In this method, the equivalent-width is automatically measured using Gaussian fitting. A comparison between our results and those from traditional analysis shows that the typical error for equivalent width is around 3.8% in our method. Developing such automatic routines does not mean to replace the interactive reduction method: it is just for a quick extraction of information from the spectra, especially those obtained in large sky surveys.
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| 关 键 词： | 恒星 丰度 射线速度 高分辨率光谱 自动归一化 等价宽度测量 |
Automatic Normalization and Equivalent-Width Measurement of High-Resolution Stellar Spectra |
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| Jing-Kun Zhao,Gang Zhao,Yu-Qin Chen,Jian-Rong Shi,Yu-Juan Liu,Ju-Yong Zhang. Automatic Normalization and Equivalent-Width Measurement of High-Resolution Stellar Spectra[J]. Chinese Journal of Astronomy and Astrophysics, 2006, 6(6): 689-696 |
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| Authors: | Jing-Kun Zhao Gang Zhao Yu-Qin Chen Jian-Rong Shi Yu-Juan Liu Ju-Yong Zhang |
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| Affiliation: | National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 |
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| Abstract: | It is well known that normalization, radial velocity correction and equivalent-width measurement of high-resolution stellar spectra are time-consuming work. In order to improve the efficiency we present an automatic method for these routines. The continuum is determined by fitting the 'high points' in the spectrum. After continuum normalization, the program automatically searches for the position of the Ha line and obtains a rough radial velocity, then computes an accurate radial velocity by cross-correlation between the given spectrum and the solar spectrum. In this method, the equivalent-width is automatically measured using Gaussian fitting. A comparison between our results and those from traditional analysis shows that the typical error for equivalent width is around 3.8% in our method. Developing such automatic routines does not mean to replace the interactive reduction method: it is just for a quick extraction of information from the spectra, especially those obtained in large sky surveys. |
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| Keywords: | techniques: radial velocities - stars: abundances |
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