低分辨光谱法自动测定[Fe/H]和[C/Fe]
Automated Determination of [Fe/H] and [C/Fe] from Low-Resolution Spectroscopy
摘要：
我们开发了一种自动光谱合成技术，用于估计贫金属星（包括碳增强贫金属星）的金属丰度（[Fe/H]）和碳丰度（[C/Fe]），其他方法可能证明是不够的。这种技术，autoMOOG，旨在对即使在低到中分辨率光谱中可见的相对较强的特征进行操作，产生的结果与更多望远镜密集型高分辨率研究相当。我们验证了这种方法与913颗恒星，现有的高分辨率和低到中分辨率到中分辨率的光谱进行比较，并涵盖了广泛的恒星参数。我们发现，在低金属丰度（[Fe/H] < -2.0），我们成功地恢复了金属丰度和碳丰度，在可能的情况下，精度为~ 0.20 dex。在更高的金属丰度下，由于在运行autoMOOG之前进行光谱归一化的连续体放置问题，可以看到恒星的整体金属丰度被普遍低估，尽管碳丰度仍然被成功恢复。因此，这种方法只推荐用于已知金属丰度足够低的恒星样本。然而，对于这些低金属量的恒星，autoMOOG的表现比类似的现有技术更加一致和快速，这应该允许在不久的将来分析大量贫金属恒星样本。目前正在采取措施，改善和纠正连续性安置方面的困难。
英文摘要：
We develop an automated spectral synthesis technique for the estimation of metallicities ([Fe/H]) and carbon abundances ([C/Fe]) for metal-poor stars, including carbon-enhanced metal-poor stars, for which other methods may prove insufficient. This technique, autoMOOG, is designed to operate on relatively strong features visible in even low- to medium-resolution spectra, yielding results comparable to much more telescope-intensive high-resolution studies. We validate this method by comparison with 913 stars which have existing high-resolution and low- to medium-resolution to medium-resolution spectra, and that cover a wide range of stellar parameters. We find that at low metallicities ([Fe/H] < -2.0), we successfully recover both the metallicity and carbon abundance, where possible, with an accuracy of ~ 0.20 dex. At higher metallicities, due to issues of continuum placement in spectral normalization done prior to the running of autoMOOG, a general underestimate of the overall metallicity of a star is seen, although the carbon abundance is still successfully recovered. As a result, this method is only recommended for use on samples of stars of known sufficiently low metallicity. For these low-metallicity stars, however, autoMOOG performs much more consistently and quickly than similar, existing techniques, which should allow for analyses of large samples of metal-poor stars in the near future. Steps to improve and correct the continuum placement difficulties are being pursued.
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