Collaborative Research: Finding the Double Sunsets - Stellar Multiplicity Across the Milky Way Halo

合作研究：寻找双重日落——银河系光环上的恒星多重性

• 批准号: 1909584
• 负责人: Matthew Walker
• 金额: $ 54.9万
• 依托单位: Carnegie-Mellon University
• 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 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1909584&HistoricalAwards=false
• 关键词: Collaborative; Research; Finding; Double; Sunsets

Unlike our own Sun, many stars in the Milky Way have one or more companions. Not only do these multiple star systems make for the pretty double sunsets like that seen by Luke Skywalker in the film "Star Wars", they also help astronomers to learn how stars form from gas clouds. These stars change with time and affect their surroundings. Yet astronomers' understanding of stellar "multiplicity" is limited to just a few basic properties, like the fraction of stars that have companions within the Milky Way. The investigators will use already available data from two extensive astronomical surveys to learn much more about multiple star systems. The investigators will learn how the stellar sizes and masses depend on their ages, chemical composition and galactic environment. The investigators will develop a new statistical technique to glean this information from as few as 3-5 observations per star. The different data sets will span the entire Milky Way, from its disk to its halo and also to dwarf galaxy satellites. The program will be the first of its kind to learn the details of multiple star systems in so many different environments.The investigators will host workshops, aimed at middle- and high-school educators from local schools, to share the experience of research using on-line tools. Their efforts will enhance an educator-focused resource for teaching topics in mathematics, physics and computer science.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.

与我们的太阳不同，银河系中的许多恒星都有一个或多个伴星。 这些多星星系统不仅像卢克·天行者在电影《星星大战》中看到的那样形成了漂亮的双日落，它们还帮助天文学家了解恒星是如何从气体云中形成的。 这些恒星随着时间的推移而变化，并影响着周围的环境。 然而，天文学家对恒星“多样性”的理解仅限于几个基本性质，例如银河系内有伴星的恒星比例。 研究人员将利用两次广泛的天文调查中已经获得的数据来了解更多关于多星星系统的信息。 研究人员将了解恒星的大小和质量如何取决于它们的年龄，化学成分和银河系环境。研究人员将开发一种新的统计技术，从每颗星星的3-5次观测中收集这些信息。 不同的数据集将涵盖整个银河系，从它的盘到它的晕，也到矮星系卫星。 该项目将是第一个在如此多的不同环境中了解多个星星系统细节的项目。研究人员将举办研讨会，针对当地学校的初中和高中教育工作者，分享使用在线工具进行研究的经验。 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

Broken into Pieces: ATLAS and Aliqa Uma as One Single Stream

• DOI: 10.3847/1538-4357/abeb18
• 发表时间: 2020-06
• 期刊: The Astrophysical Journal
• 作者: Ting S. Li;Sergey E. Koposov;D. Erkal;A. Ji;N. Shipp;A. Pace;T. Hilmi;K. Kuehn;G. Lewis

Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III

• DOI: 10.3847/1538-4357/ab6213
• 发表时间: 2019-12
• 期刊: The Astrophysical Journal
• 作者: A. Ji;Ting S. Li;J. Simon;J. Marshall;K. Vivas;A. Pace;K. Bechtol;A. Drlica-Wagner;Sergey E.

Binary deviations from single object astrometry

• DOI: 10.1093/mnras/staa1148
• 发表时间: 2020-03
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Z. Penoyre;V. Belokurov;N. Evans;A. Everall;Sergey E. Koposov

Unresolved stellar companions with Gaia DR2 astrometry

• DOI: 10.1093/mnras/staa1522
• 发表时间: 2020-08-01
• 期刊: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
• 影响因子: 4.8
• 作者: Belokurov, Vasily;Penoyre, Zephyr;Brown, Anthony G. A.
• 通讯作者: Brown, Anthony G. A.

Two-point Separation Functions for Modeling Wide Binary Systems in Nearby Dwarf Galaxies

• DOI: 10.3847/1538-4357/ac5b5f
• 发表时间: 2021-07
• 期刊: The Astrophysical Journal
• 作者: Christopher Kervick;M. Walker;J. Peñarrubia;Sergey E. Koposov