权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Collaborative Research: RUI: Understanding Stellar Structure Using Lithium and New Steps Toward the Big Bang Lithium Abundance

合作研究：RUI：利用锂了解恒星结构以及实现大爆炸锂丰度的新步骤

基本信息

批准号：
1909005
负责人：
Aaron Steinhauer
金额：
$ 16.62万
依托单位：
SUNY College at Geneseo
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=1909005&HistoricalAwards=false
关键词：
Collaborative Research RUI Understanding Stellar

项目摘要

The abundance of Lithium, relative to Hydrogen, is a key prediction of Big Bang models of the early universe. Abundances of the elements can be measured using the absorption lines in stellar spectra. But Lithium can also be destroyed in stars when convection mixes surface material with the hotter stellar interiors. Low abundance of Lithium in stellar atmospheres is seen among stars where processes that deplete Lithium would not be expected to occur, and abundances are far lower than predicted for stars where such depletion processes are expected to be operating. This team will measure the abundance of Lithium in the atmospheres of a carefully selected sample of stars in order to better understand physical processes inside stars. They hope to determine whether the Sun is a normal or abnormal star for its mass and age, whether there is variation in Lithium destruction among supposedly identical stars, and better understand the disagreement between the Big Bang Lithium abundance inferred from the microwave background observations and that seen in stellar atmospheres. This is a collaborative effort among astronomers at four universities, including a predominantly undergraduate institution. This project will lead to at least one PhD thesis and extend the educational opportunities for undergraduates at the individual schools by integrating a team of students in a large-scale research program, using astronomical observatories in Arizona, California, and Australia.The research team will extend and expand its spectroscopic studies of stars in open and globular clusters, emphasizing the old open clusters M67 and NGC188, and the nearest globular cluster, NGC6397. Their goals are (a) determine whether the Sun is a normal or abnormal star for its mass and age, (b) determine if there is variation in the physical mechanisms controlling Li destruction among supposedly identical stars, (c) pioneer studies on the role of stellar metal content in determining the level of Li-depletion, and (d) study the potential impact of stellar evolution on metal deficient stars of the halo, with implications for the true level of disagreement (if any) between the value of the Big Bang Li abundance inferred from the microwave background versus that inferred from halo dwarf surface Li abundances.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.

相对于氢，锂的丰度是早期宇宙大爆炸模型的一个关键预测。元素的丰度可以用恒星光谱中的吸收线来测量。但当对流将表面物质与更热的恒星内部混合在一起时，恒星中的锂也会被摧毁。在恒星大气中锂的丰度很低，在这些恒星中，预计不会发生耗尽锂的过程，而且丰度远远低于预期正在进行这种耗尽过程的恒星。该团队将测量精心挑选的恒星大气中锂的丰度，以便更好地了解恒星内部的物理过程。他们希望确定太阳对于其质量和年龄来说是正常的还是异常的恒星，在被认为相同的恒星之间是否存在锂破坏的差异，并更好地理解从微波背景观测得出的大爆炸锂丰度与恒星大气中看到的锂丰度之间的不一致。这是四所大学的天文学家共同努力的结果，其中包括一所以本科为主的机构。该项目将利用亚利桑那州、加利福尼亚州和澳大利亚的天文台，通过整合一组学生参与一项大规模研究计划，至少获得一篇博士论文，并扩大个别学校本科生的教育机会。研究小组将扩大和扩大其对疏散星团和球状星团中恒星的光谱研究，重点是旧的疏散星团M67和NGC188，以及最近的球状星团NGC6397。他们的目标是(A)确定太阳在其质量和年龄方面是正常的还是不正常的恒星，(B)确定在被认为相同的恒星中控制锂破坏的物理机制是否存在差异，(C)开创性地研究恒星中的金属含量在确定锂的贫乏程度中的作用，以及(D)研究恒星演化对晕中缺乏金属的恒星的潜在影响，这项裁决反映了美国国家科学基金会的法定使命，并通过使用基金会的学术价值和更广泛的影响审查标准进行了评估，认为值得支持。

项目成果

期刊论文数量（6）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

WIYN Open Cluster Study LXXIX. M48 (NGC 2548) I. Radial Velocities, Rotational Velocities, and Metallicities of Stars in the Open Cluster M48 (NGC 2548)

DOI：
10.3847/1538-3881/ab83ef
发表时间：
2020-04
期刊：
The Astronomical Journal
影响因子：
0
作者：
Qinghui Sun;C. Deliyannis;A. Steinhauer;B. Twarog;B. Anthony-Twarog
通讯作者：
Qinghui Sun;C. Deliyannis;A. Steinhauer;B. Twarog;B. Anthony-Twarog

WIYN Open Cluster Study LXXX: HDI CCD UBVRI Photometry of the Old Open Cluster NGC 7142 and Comparison to M67

WIYN 疏散星团研究 LXXX：旧疏散星团 NGC 7142 的 HDI CCD UBVRI 光度测量以及与 M67 的比较

DOI：
10.3847/1538-3881/ab8814
发表时间：
2020
期刊：
The Astronomical Journal
影响因子：
0
作者：
Sun, Qinghui;Deliyannis, Constantine P.;Twarog, Bruce A.;Anthony-Twarog, Barbara J.;Steinhauer, Aaron
通讯作者：
Steinhauer, Aaron