A method of measuring the [alpha/Fe] ratios from the spectra of the LAMOST survey
A method of measuring the [alpha/Fe] ratios from the spectra of the LAMOST survey
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一种根据 LAMOST 巡天光谱测量 [α/Fe] 比率的方法
DOI：
10.1088/1674-4527/16/7/110
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发表时间：
2016
影响因子：
1.8
通讯作者：
Li
中科院分区：
文献类型：
--
作者：
Li Ji;Han Chen;Ci Xuan;Zhang Xiao-Feng;Wang Yue-Xiang;Xiang Mao-Sheng;Liu Xiao-Wei;Zhang Hua-Wei;Yuan Hai-Bo;Huang Yang;Xiang Mao-Sheng;Shi Jian-Rong;Zhao Jing-Kun;Cao Zi-Huang;Liu Xiao-Wei;Zhang Hua-Wei;Yuan Hai-Bo;Zhang Yong;Hou Yong-Hui;Wang Yue-Fei;Li
恒星中的[α/Fe]比率是探测恒星族形成历史和银河系化学演化的良好示踪剂。 LAMOST 的光谱巡天为确定银河系中数百万颗恒星的[α/Fe]提供了良好的机会。我们提出了一种使用 LSP3 管道的模板匹配技术测量 LAMOST 光谱中 [α/Fe] 比率的方法。我们使用从 ELODIE 和 MILES 库中选择的三个恒星测试样本以及 LEGUE 调查来验证我们的方法。根据测试结果，我们得出结论，我们的方法对于从 LAMOST 调查获得的低分辨率光谱中测量 [α/Fe] 是有效的。在恒星参数 T eff=[5000, 7500] K、log g=[1.0, 5.0] dex 和 [Fe/H]=[-1.5,+ 0.5] dex 范围内，我们的 [α/Fe] 测量值与高分辨率光谱得出的值一致，并且我们的 LAMOST 光谱 [α/Fe] 测量精度优于 0.1 dex，光谱信噪比高于20.
The [α/Fe] ratios in stars are good tracers to probe the formation history of stellar populations and the chemical evolution of the Galaxy. The spectroscopic survey of LAMOST provides a good opportunity to determine [α/Fe] of millions of stars in the Galaxy. We present a method of measuring the [α/Fe] ratios from LAMOST spectra using the template-matching technique of the LSP3 pipeline. We use three test samples of stars selected from the ELODIE and MILES libraries, as well as the LEGUE survey to validate our method. Based on the test results, we conclude that our method is valid for measuring [α/Fe] from low-resolution spectra acquired by the LAMOST survey. Within the range of the stellar parameters T eff=[5000, 7500] K, log g=[1.0, 5.0] dex and [Fe/H]=[-1.5,+ 0.5] dex, our [α/Fe] measurements are consistent with values derived from high-resolution spectra, and the accuracy of our [α/Fe] measurements from LAMOST spectra is better than 0.1 dex with spectral signal-to-noise higher than 20.