UvA-DARE (Digital Academic Repository) Calibrations of Atmospheric Parameters Obtained from the First Year of SDSS-III APOGEE Observations
UvA-DARE (Digital Academic Repository) Calibrations of Atmospheric Parameters Obtained from the First Year of SDSS-III APOGEE Observations
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发表时间：
2013
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通讯作者：
Mészáros;Sz. Holtzman;J. G. Pérez;A. Prieto;C. Schiavon;R. Basu;S. Bizyaev;D. Chaplin;
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作者：
Mészáros;Sz. Holtzman;J. G. Pérez;A. Prieto;C. Schiavon;R. Basu;S. Bizyaev;D. Chaplin;
斯隆数字巡天 III (SDSS-III) 阿帕奇点天文台银河演化实验 (APOGEE) 是一项为期三年的调查，正在多个星系群中收集 105 个近红外高分辨率光谱。为了从这个海量数据集中获取恒星参数和化学成分，开发了 APOGEE 恒星参数和化学丰度管道 (ASPCAP)。在这里，我们描述了第一个 SDSS-III APOGEE 数据发布 (DR10) 中提出的恒星参数的经验校准。这些校准是通过对 20 个球状星团和疏散星团中 559 颗恒星的观测而实现的。对星团观测的补充是对美国宇航局开普勒场中恒星的观测，这些恒星通过星震分析确定了表面重力。我们讨论了导出的恒星参数的准确性和精确性，特别考虑了有效温度、表面重力和金属丰度；我们还简要讨论了 α 元素、碳和氮丰度的推导结果。总体而言，我们发现 ASPCAP 在温度和金属丰度方面取得了相当准确的结果，但在表面重力方面存在系统误差。我们推导出校准关系，使原始 ASPCAP 结果与独立确定的恒星参数更好地一致。团簇内 ASPCAP 参数的内部分散表明，金属丰度的测量精度优于 0.1 dex，有效温度优于 150 K，表面重力优于 0.2 dex。集群和开普勒巨头对当前准确性和精度的理解对于管道的未来改进将是无价的。
The Sloan Digital Sky Survey III (SDSS-III) Apache Point Observatory Galactic Evolution Experiment (APOGEE) is a three-year survey that is collecting 105 high-resolution spectra in the near-IR across multiple Galactic populations. To derive stellar parameters and chemical compositions from this massive data set, the APOGEE Stellar Parameters and Chemical Abundances Pipeline (ASPCAP) has been developed. Here, we describe empirical calibrations of stellar parameters presented in the first SDSS-III APOGEE data release (DR10). These calibrations were enabled by observations of 559 stars in 20 globular and open clusters. The cluster observations were supplemented by observations of stars in NASA’s Kepler field that have well determined surface gravities from asteroseismic analysis. We discuss the accuracy and precision of the derived stellar parameters, considering especially effective temperature, surface gravity, and metallicity; we also briefly discuss the derived results for the abundances of the α-elements, carbon, and nitrogen. Overall, we find that ASPCAP achieves reasonably accurate results for temperature and metallicity, but suffers from systematic errors in surface gravity. We derive calibration relations that bring the raw ASPCAP results into better agreement with independently determined stellar parameters. The internal scatter of ASPCAP parameters within clusters suggests that metallicities are measured with a precision better than 0.1 dex, effective temperatures better than 150 K, and surface gravities better than 0.2 dex. The understanding provided by the clusters and Kepler giants on the current accuracy and precision will be invaluable for future improvements of the pipeline.