The Origins of Fastest Stars in the Milky Way: A Chemo-Kinematic Perspective

银河系中最快恒星的起源：化学运动学视角

• 批准号: 1907417
• 负责人: Keith Hawkins
• 金额: $ 30.25万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1907417&HistoricalAwards=false
• 关键词: Origins; Fastest; Stars; Milky; Way

The fastest stars in the Galaxy are often referred to as hypervelocity stars (HVSs). These stars are excellent laboratories to study the extreme physics that accelerates stars. The stars are also key tracers of the Galaxy's elusive dark matter. Yet their origin and nature are still not well understood. With new data from the Gaia spacecraft, hundreds of these fast-moving elusive stars have been found. The investigator's primary goal to understand the origins and nature of HVSs. This project will also discover new HVSs using the next release of data from the Gaia mission. The chemical fingerprint of these fast-moving stars will also be measured to tag where they were born. The project will also measure the motions of these stars to constrain the mass of the Galaxy and determine the physics needed to accelerate stars to such high speeds. Each of these novel measurements will advance the field by providing key constraints of the origin of HVSs and use them to make inferences about the mass of the Milky Way and its dark matter halo. The investigator will engage the public and train the next generation of our STEM workforce with an emphasis on under-represented minority students. The investigator will work with students from the TARUS program at the University of Texas. This program focuses on training minority students in various aspects of computer coding and research methods. This project, through TARUS, will provide underrepresented minority students technical expertise that can be transferable throughout STEM careers. The project will also advance public scientific literacy by creating an annual 'Stars on the Run' outreach night for Austin, TX area. This event will enable the public to learn about the fastest stars discovered by this project. It will also focus teaching the public about basic astronomical and physical principals. This will be done through an exciting set of lectures, demos, and night sky observing.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

银河系中速度最快的恒星通常被称为超高速恒星（HVS）。这些恒星是研究加速恒星的极端物理的优秀实验室。这些恒星也是银河系难以捉摸的暗物质的关键示踪剂。然而它们的起源和性质仍然没有得到很好的了解。根据盖亚航天器的新数据，人们发现了数百颗快速移动的难以捉摸的恒星。研究人员的主要目标是了解 HVS 的起源和性质。该项目还将利用盖亚任务的下一版本数据发现新的 HVS。这些快速移动恒星的化学指纹也将被测量，以标记它们的诞生地点。该项目还将测量这些恒星的运动，以限制银河系的质量，并确定将恒星加速到如此高的速度所需的物理原理。这些新颖的测量中的每一项都将通过提供 HVS 起源的关键约束来推进该领域的发展，并利用它们来推断银河系及其暗物质晕的质量。调查员将吸引公众参与并培训下一代 STEM 劳动力，重点关注代表性不足的少数族裔学生。调查人员将与德克萨斯大学 TARUS 项目的学生一起工作。该计划重点培训少数民族学生计算机编码和研究方法的各个方面。该项目将通过 TARUS 为代表性不足的少数族裔学生提供可在整个 STEM 职业生涯中转移的技术专业知识。该项目还将通过为德克萨斯州奥斯汀地区举办一年一度的“奔跑之星”外展之夜来提高公众的科学素养。此次活动将使公众了解该项目发现的速度最快的恒星。它还将重点向公众传授基本的天文学和物理原理。这将通过一系列令人兴奋的讲座、演示和夜空观测来完成。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

J01020100−7122208: an accreted evolved blue straggler that was not ejected from a supermassive black hole

J01020100–7122208：一个吸积进化的蓝色离散粒子，不是从超大质量黑洞中喷射出来的

• DOI: 10.1093/mnras/stab3364
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: De Brito Silva, Danielle;Jofré, Paula;Bourbert, Douglas;Koposov, Sergey E.;Prieto, Jose L.;Hawkins, Keith
• 通讯作者: Hawkins, Keith

The COMBS Survey - II. Distinguishing the metal-poor bulge from the halo interlopers

• DOI: 10.1093/mnras/stab003
• 发表时间: 2020-09
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: M. Lucey;K. Hawkins;M. Ness;V. Debattista;A. Luna;M. Asplund;T. Bensby;L. Casagrande;S. Feltzing

A GALAH view of the chemical homogeneity and ages of stellar strings identified in Gaia

盖亚中发现的恒星弦的化学均匀性和年龄的 GALAH 视图

• DOI: 10.1093/mnras/stac236
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Manea, Catherine;Hawkins, Keith;Maas, Zachary G.
• 通讯作者: Maas, Zachary G.

The chemical nature of the young 120-Myr-old nearby Pisces–Eridanus stellar stream flowing through the Galactic disc

• DOI: 10.1093/mnras/staa1673
• 发表时间: 2020-03
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: K. Hawkins;M. Lucey;J. Curtis

Carbon-enhanced metal-poor star candidates from BP/RP spectra in Gaia DR3

• DOI: 10.1093/mnras/stad1675
• 发表时间: 2022-06
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: M. Lucey;Nariman Al Kharusi-Nariman-Al Kharusi-2222945668;K. Hawkins;Y. Ting;Nesar Ramachandra;A. Price-Whelan;T. Beers;Y. S. Lee;J. Yoon