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New Frontiers in Stellar Astrophysics: Massive Stars as Cosmological Tools

恒星天体物理学的新前沿：大质量恒星作为宇宙学工具

基本信息

批准号：
1714285
负责人：
Emily Levesque
金额：
$ 40.84万
依托单位：
University of Washington
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1714285&HistoricalAwards=false
关键词：
New Frontiers Stellar Astrophysics Massive

项目摘要

Stars more than 10 times as massive as the Sun are important building blocks in our Universe. Their violent deaths in supernova explosions, in which stars are unable to hold themselves up against gravity, release new material into galaxies to form new stars. These massive stars are bright, and thus they hold promise as distance estimators to distant galaxies. If we know how bright a star should look, we can compare its apparent brightness to find its distance. Unfortunately, these stars are rare and thus poorly understood at the moment. The investigator plans to collect basic data about massive, luminous stars in other galaxies. The observations will help us better understand the lives of these stars. Both graduate and undergraduate students will take part in the research. She will also work with the Zooniverse Project to convert the light variations of astronomical objects---usually conveyed visually---to sound. This effort will be of interest to citizen scientists, particularly those who are visually impaired.The investigator describes a multi-wavelength observing plan that covers the post-main sequence phases of stellar evolution before the stars explode as supernovae. The ongoing HST COS far-UV SNAP program provides high S/N spectra, with better resolution, than were previously possible. The project will sample objects of different metallicity, including extremely-metal-poor galaxies, that will serve as analogs for star formation regions in the early Universe. The investigator will also create a comprehensive library of ultraviolet spectra using observations of 87 nearby star-forming galaxies, using these data to test the next generation of stellar population synthesis and photoionization codes.

质量超过太阳10倍的恒星是我们宇宙的重要组成部分。它们在超新星爆炸中的剧烈死亡，在这种爆炸中，恒星无法抵抗引力，将新的物质释放到星系中，形成新的恒星。这些大质量恒星非常明亮，因此它们有望成为遥远星系的距离估计器。如果我们知道一颗星星看起来应该有多亮，我们就可以比较它的视亮度来求出它的距离。不幸的是，这些恒星非常罕见，因此目前对其了解甚少。研究人员计划收集有关其他星系中大质量发光恒星的基本数据。这些观测将帮助我们更好地了解这些恒星的生命。研究生和本科生都将参加这项研究。她还将与Zooniverse项目合作，将天文物体的光变化-通常是视觉传达-转换为声音。这项工作将是感兴趣的公民科学家，特别是那些谁是视障者，调查人员描述了一个多波长的观测计划，涵盖恒星爆炸成为超新星之前的恒星演化的主序后阶段。正在进行的HST COS远紫外SNAP计划提供了高S/N光谱，分辨率比以前更好。该项目将对不同金属丰度的天体进行采样，包括金属含量极低的星系，这些天体将作为早期宇宙中星星形成区的类似物。研究人员还将利用对附近87个恒星形成星系的观测，创建一个全面的紫外光谱库，利用这些数据测试下一代恒星种群合成和光电离代码。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Prospects for Multimessenger Observations of Thorne–Żytkow Objects

DOI：
10.3847/1538-4357/abebe1
发表时间：
2021-03
期刊：
The Astrophysical Journal
影响因子：
0
作者：
L. DeMarchi;J. R. Sanders;E. Levesque
通讯作者：
L. DeMarchi;J. R. Sanders;E. Levesque

A Spatially Resolved Study of the GRB 020903 Host Galaxy

DOI：
10.3847/1538-4357/aab093
发表时间：
2017-07
期刊：
The Astrophysical Journal
影响因子：
0
作者：
M. Thorp;E. Levesque
通讯作者：
M. Thorp;E. Levesque

The Properties of Fast Yellow Pulsating Supergiants: FYPS Point the Way to Missing Red Supergiants

DOI：
10.3847/1538-4357/ac79b2
发表时间：
2022-06
期刊：
The Astrophysical Journal
影响因子：
0
作者：
T. Dorn-Wallenstein;E. Levesque;J. Davenport;K. Neugent;B. Morris;K. Bostroem
通讯作者：
T. Dorn-Wallenstein;E. Levesque;J. Davenport;K. Neugent;B. Morris;K. Bostroem

Photometric Classifications of Evolved Massive Stars: Preparing for the Era of Webb and Roman with Machine Learning