Collaborative Research: Chemical Cartography in the Milky Way with APOGEE

合作研究：与 APOGEE 进行银河系化学制图

• 批准号: 1109718
• 负责人: Steven Majewski
• 金额: $ 25.22万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1109718&HistoricalAwards=false
• 关键词: Collaborative; Research; Chemical; Cartography; Milky

The PI and his team work on the scientific outcomes from the large and systematic survey for precision stellar elemental abundance analyses that is set out to map the spatial variations in the chemistry across the Milky Way Galactic disk. They employ the Apache Point Observatory Galactic Evolution Experiment (APOGEE) in the Sloan Digital Sky Survey (SDSS)-III survey, which is a large-scale, near-infrared (H-band), high-resolution (R ~ 30,000), high signal-to-noise (100) spectroscopic survey of Milky Way stellar populations. The survey covers wavelengths from 1.51-1.68 microns which is a region that includes useful absorption lines from about 15 chemical elements, including alpha, odd-numbered, and iron peak elements. A three-year bright-time observing campaign from 2011-2014 will enable APOGEE to observe about 100,000 giants stars across the Galactic bulge, disk and halo, with the vast majority of these stars in the disk. This large catalog of chemical abundance data for stars all across the Milky Way from APOGEE is used to address a number of key questions related to the chemistry of the Galactic disk.The analysis of the data from the APOGEE pipeline gives the stellar parameters (e.g., effective temperatures, gravity, metallicity) and abundances for about 15 elements which are used to deduce additional stellar properties (star-by-star extinctions, distances, ages) that are needed to map the abundances in the disk and to constrain models of Galactic chemical evolution. These maps provide the three-dimensional distributions represent an order of magnitude improvement in what has been achieved before in terms of numbers of stars included, numbers of chemical elements probed, homogeneity in the collection, reduction, and calibration of the data, and spatial coverage, including vast regions of the disk never before probed because of the limitations from dust. As part of this work, the team plans to release a value-added APOGEE catalog of extinctions, distances and age estimates, along with the APOGEE data on abundances of about 15 chemical elements for about 100,000 stars from the thin and thick disks, and the reduction of these data into multidimensional maps of elemental abundances. These data should have significant value to the wider community of Galactic chemical evolution modelers.

PI及其团队从大型和系统的调查中进行了科学成果，以进行精确的恒星元素丰度分析，这些分析旨在绘制银河系磁盘上化学的空间变化。他们在斯隆人数字天空调查（SDSS）-III调查中采用了Apache点观测的银河系进化实验（Apogee），这是一项大规模的，近红外（H频段），高分辨率（R〜30,000），高信号到噪声（100）的（100）对MILKY MILKY MILKY WAY STELLAR STELLAR STELLAR STELLAR STELLAR群体的调查。该调查涵盖了1.51-1.68微米的波长，该波长包括大约15个化学元件的有用吸收线，包括α，奇数和铁峰元素。从2011 - 2014年开始进行的三年亮度观察活动将使Apogee能够在整个银河凸起，磁盘和Halo中观察大约100,000个巨人星，其中绝大多数这些恒星都在磁盘中。从Apogee整个银河系中，恒星的化学丰度数据的大量目录用于解决与银河磁盘化学相关的许多关键问题。对Apogee管道中数据的分析提供了恒星参数（例如，有效的温度，重力，金属性，金属性），并适用于大约15个元素，这些元素适用于15个元素 - 适用于大约stell stell stell stellar stellar stell stellar stellar stall stall stall stall stall stall stell，距离绘制磁盘中的丰度并约束银河化学演化模型所需的距离，年龄）。这些地图提供了三维分布，代表了以前在包括的恒星数量，探测的化学元件数量，收集中的均匀性，数据的减少和空间覆盖范围的数量级改进，包括磁盘的巨大区域，因为灰尘的限制。作为这项工作的一部分，该团队计划释放灭绝，距离和年龄估计的增值脱口秀目录，以及从薄和厚的磁盘中释放大约100,000星的大约100个化学元素的座椅数据，以及将这些数据减少到元素丰度的多维图中。这些数据应该对更广泛的银河化学演化建模者具有重要价值。