The Open Cluster Chemical Abundance and Mapping (OCCAM) Survey

天文学家正在努力了解星系在宇宙历史中是如何变化的。 我们的银河系提供了最好的机会来了解螺旋星系随时间变化的细节。 为了测量随时间的变化，研究人员将确定恒星群，称为星星集群，他们可以可靠地估计年龄。 一个关键的变化是恒星的化学组成。 在这个项目中，研究人员将收集一大组星星团，以测量整个星系随时间的化学变化。 该项目将为国家利益服务，因为它通过提供一个独特的目录来探索银河系的历史，从而促进天文学研究的进展。 调查人员将在德克萨斯州沃斯堡的蒙尼格陨石画廊开展外展活动，并增加现有的项目。 开放星系团化学分析和绘图（OCCAM）调查是一项利用星星团作为关键的年龄测定化学和动力学示踪剂种群来了解银河系化学和动力学演化的计划。 OCCAM将测量作为年龄函数和在银河系盘中位置函数的动力学和化学丰度趋势。 他们将测试化学标记是否可以在银河系盘中工作，以及疏散星团是否参与径向迁移。 该项目将使用SDSS-IV/APOGEE-2调查的统一测光，尖端天体测量和化学。 额外的光学高分辨率光谱学将补充APOGEE数据，增加中子捕获元素，以创建一个多达400个开放星星集群的独特目录，从而系统地测量年龄，距离，红化和20多种元素的详细丰度。

Astronomers are working to understand how galaxies change throughout the history of the Universe. Our Milky Way galaxy allows the best opportunity to understand the details of a spiral galaxy's change over time. To measure changes over time the investigators will identify groups of stars, called star clusters, for which they can reliably estimate the ages. One key change is the chemical make-up of stars. For this project, the investigators will assemble a large set of star clusters to measure chemical changes with time across the galaxy. This project will serve the national interest as it promotes the progress of research in astronomy by providing a unique catalog to probe the history of the Milky Way. The investigators will run outreach activities and add to existing programs at the Monnig Meteorite Gallery in Fort Worth, TX. They will also train graduate and undergraduate students in modern data science research and analysis techniques.The Open Cluster Chemical Analysis and Mapping (OCCAM) survey is a program to understand the chemical and dynamical evolution of the Milky Way by using star clusters as a key age-datable chemical and dynamical tracer population. OCCAM will measure the dynamical and chemical abundance trends as a function of age and a function of position in the disk of the Milky Way galaxy. They will test whether chemical tagging can work in the Milky Way disk and if open clusters participate in radial migration. This project will use uniform photometry, cutting-edge astrometry, and chemistry from the SDSS-IV/APOGEE-2 survey. Additional optical high-resolution spectroscopy will supplement the APOGEE data, adding neutron capture elements, to create a unique catalog of up to 400 open star clusters leading to systematically measured ages, distances, reddening, and detailed abundances for more than 20 elements.