The Open Cluster Chemical Abundances and Mapping Survey. VII. APOGEE DR17 [C/N]–Age Calibration
The Open Cluster Chemical Abundances and Mapping Survey. VII. APOGEE DR17 [C/N]–Age Calibration
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DOI：
10.3847/1538-3881/ac5d53
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发表时间：
2022-03
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通讯作者：
Taylor Spoo;J. Tayar;P. Frinchaboy;K. Cunha;Natalie Myers;J. Donor;S. Majewski;D. Bizyaev;D. A. García-Hernández;H. Jönsson;R. Lane;K. Pan;P. Longa-Peña;A. Roman-Lopes
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作者：
Taylor Spoo;J. Tayar;P. Frinchaboy;K. Cunha;Natalie Myers;J. Donor;S. Majewski;D. Bizyaev;D. A. García-Hernández;H. Jönsson;R. Lane;K. Pan;P. Longa-Peña;A. Roman-Lopes
大规模调查开启了从化学和运动学角度研究银河演化的可能性；然而，可靠的恒星年龄仍然是一个重大挑战。对星团中的恒星进行高分辨率光谱调查所提供的详细化学信息可用作校准最近开发的用于野外恒星年龄测定的化学工具的手段。利用来自疏散星团丰度和测绘调查的数据，基于斯隆数字巡天/阿帕奇点天文台银河演化实验2调查，我们得出了疏散星团恒星年龄与演化恒星（主要是红巨星分支上的恒星）碳氮（[C/N]）丰度比之间的新经验关系。通过这种校准，[C/N]可以用作演化场恒星的化学钟，以研究银河系不同部分的形成和演化。我们探索不同恒星演化阶段（如红色团块）的混合效应如何影响导出的校准。我们已经建立了 APOGEE 数据版本 17 (DR17) 巨星丰度的 [C/N]-年龄校准为 log[Age(yr)]DR17=10.14(±0.08)+2.23(±0.19)[C/N] ，可用于 8.62≤log(Age[yr])≤9.82 ，源自作为 APOGEE 一部分观测到的 49 个星团的均匀样本DR17 主要适用于富含金属的薄盘和厚盘巨星。这种测量的 [C/N]-年龄 APOGEE DR17 校准也被证明与开普勒光度测量得出的星震年龄一致。
Large-scale surveys open the possibility to investigate Galactic evolution both chemically and kinematically; however, reliable stellar ages remain a major challenge. Detailed chemical information provided by high-resolution spectroscopic surveys of the stars in clusters can be used as a means to calibrate recently developed chemical tools for age-dating field stars. Using data from the Open Cluster Abundances and Mapping survey, based on the Sloan Digital Sky Survey/Apache Point Observatory Galactic Evolution Experiment 2 survey, we derive a new empirical relationship between open cluster stellar ages and the carbon-to-nitrogen ([C/N]) abundance ratios for evolved stars, primarily those on the red giant branch. With this calibration, [C/N] can be used as a chemical clock for evolved field stars to investigate the formation and evolution of different parts of our Galaxy. We explore how mixing effects at different stellar evolutionary phases, like the red clump, affect the derived calibration. We have established the [C/N]–age calibration for APOGEE Data Release 17 (DR17) giant star abundances to be log[Age(yr)]DR17=10.14(±0.08)+2.23(±0.19)[C/N] , usable for 8.62≤log(Age[yr])≤9.82 , derived from a uniform sample of 49 clusters observed as part of APOGEE DR17 applicable primarily to metal-rich, thin- and thick-disk giant stars. This measured [C/N]–age APOGEE DR17 calibration is also shown to be consistent with asteroseismic ages derived from Kepler photometry.