CAREER: The origin of the metal-poor halo of the Milky Way

事业：银河系贫金属晕的起源

• 批准号: 1255160
• 负责人: Anna Frebel
• 金额: $ 81.67万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1255160&HistoricalAwards=false
• 关键词: CAREER; origin; metal; poor; halo

The PI will reconstruct the origin of the Milky Way's stellar halo by studying the chemical compositions of its constituents: extremely metal-poor stars in the halo itself and metal-poor stars in the least luminous dwarf galaxies orbiting about the Galaxy. She will leverage her access to the Australian SkyMapper Telescope to identify large numbers of stars in the Galactic halo, and combine these data with high spectral resolution observations using the Magellan telescope. She will therefore assemble a legacy data set of the most metal-poor stars in the galaxy, which will substantially advance our understanding of the early universe and the build-up of the old stellar halo of the Milky Way. In concert, the PI will produce accompanying theoretical frameworks that allow for a cosmologically informed interpretation of stellar abundance measurements. The program has three specific goals: (1) to perform stellar archaeology, giving us new constraints on the major physical processes that drove early star formation; (2) to perform dwarf-galaxy archaeology, allowing us to better understand galaxy formation; and (3) to determine the role of metal-poor stars as tracers of the accretion history of the Milky Way halo.The PI will disseminate her research to a broad audience by publicly releasing her new measurements on the chemical abundances of stars. She will also collaborate closely with the MIT Online Science, Technology, and Engineering Community (MOSTEC), which is a free online education and enrichment program for high school seniors from underserved and underrepresented communities. Finally, the PI will also create a series of short videos designed to show students how to observe with the Magellan telescopes, thereby encouraging them to be informed participants in how astronomical data are gathered.

PI将通过研究其组成成分的化学成分来重建银河系恒星晕的起源：晕本身中的极贫金属恒星和围绕银河系轨道运行的最不明亮的矮星系中的贫金属恒星。她将利用澳大利亚SkyMapper望远镜来识别银河系晕中的大量恒星，并将这些数据与麦哲伦望远镜的高光谱分辨率观测相结合。因此，她将收集银河系中最缺乏金属的恒星的遗留数据集，这将大大促进我们对早期宇宙和银河系旧恒星晕形成的理解。与此同时，PI将产生相应的理论框架，允许对恒星丰度测量进行宇宙学上的解释。该计划有三个具体目标：（1）进行恒星考古，为我们提供新的约束，对主要的物理过程，驱动早期星星形成;（2）进行矮星系考古，使我们能够更好地了解星系的形成;（3）确定金属的作用-贫穷的恒星作为银河系晕吸积历史的示踪剂。PI将通过公开发布她对银河系晕化学丰度的新测量，向广大观众传播她的研究。星她还将与麻省理工学院在线科学，技术和工程社区（MOSTEC）密切合作，这是一个免费的在线教育和丰富计划，为来自服务不足和代表性不足的社区的高中毕业生提供服务。最后，PI还将制作一系列短视频，旨在向学生展示如何使用麦哲伦望远镜进行观察，从而鼓励他们了解天文数据是如何收集的。

项目成果

The R -Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-poor Star with an Extreme R -process Enhancement of [Eu/H] = −0.14

R 工艺联盟：HD 222925 的综合丰度分析，HD 222925 是一颗贫金属恒星，R 工艺极大增强 [Eu/H] ​​= ≤0.14

• DOI: 10.3847/1538-4357/aadd92
• 发表时间: 2018
• 期刊: The Astrophysical Journal
• 作者: Roederer, Ian U.;Sakari, Charli M.;Placco, Vinicius M.;Beers, Timothy C.;Ezzeddine, Rana;Frebel, Anna;Hansen, Terese T.
• 通讯作者: Hansen, Terese T.

The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey

R 工艺联盟：对最佳低金属度恒星候选者进行光谱追踪

• DOI: 10.3847/1538-4357/aaf3b9
• 发表时间: 2019
• 期刊: The Astrophysical Journal
• 作者: Placco, Vinicius M.;Santucci, Rafael M.;Beers, Timothy C.;Chanamé, Julio;Sepúlveda, María Paz;Coronado, Johanna;Rossi, Silvia;Lee, Young Sun;Starkenburg, Else;Youakim, Kris
• 通讯作者: Youakim, Kris

JINAbase—A Database for Chemical Abundances of Metal-poor Stars

• DOI: 10.3847/1538-4365/aadfe9
• 发表时间: 2017-11
• 期刊: The Astrophysical Journal Supplement Series
• 作者: Abdu Abohalima;A. Frebel

Chemical Abundances in the Ultra-faint Dwarf Galaxies Grus I and Triangulum II: Neutron-capture Elements as a Defining Feature of the Faintest Dwarfs

• DOI: 10.3847/1538-4357/aaf3bb
• 发表时间: 2018-09
• 期刊: The Astrophysical Journal
• 作者: A. Ji;J. Simon;A. Frebel;K. Venn;T. Hansen

The opto-mechanical design of the GMT-Consortium Large Earth Finder (G-CLEF)

GMT联盟大型地球探测器（G-CLEF）的光机设计

• DOI: 10.1117/12.2313582
• 发表时间: 2018
• 期刊: Proceedings of SPIE
• 作者: Mueller, Mark A.;Szentgyorgyi, Andrew;Baldwin, Daniel;Ben-Ami, Sagi;Budynkiewicz, Jamie;Evans, Ian;Evans, Janet;Lopez-Morales, Mercedes;McCracken, Kenneth;McMuldroch, Stuart
• 通讯作者: McMuldroch, Stuart