Wide Low-Mass Binaries: Coeval Laboratories for Testing the Formation and Evolution of Stars, and the Structure and Evolution of the Milky Way

宽低质量双星：测试恒星形成和演化以及银河系结构和演化的同时代实验室

• 批准号: 0909463
• 负责人: Keivan Stassun
• 金额: $ 34.21万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0909463&HistoricalAwards=false
• 关键词: Wide; Low; Mass; Binaries; Coeval

AST-0909463StassunThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).M-dwarfs (dMs) make up about seventy percent of the stars in our Galaxy and have main sequence lifetimes longer than the age of the Galaxy. They are therefore useful probes of the structure and evolution of the Milky Way. Low-mass binaries are important coeval laboratories for testing empirical relations, as the two stars likely formed from the same material at the same time. This project will construct the largest sample of wide low-mass binaries ever assembled, and then use this sample to: (a) study the role of multiplicity in the formation of low-mass stars; (b) test and calibrate the mass-age-activity-rotation relationships that are central to stellar age determinations and that are used to determine the basic properties of exoplanet host stars; and (c) trace the history of dynamical interactions in the Milky Way. Building on the identification of all wide low-mass binaries in the Sloan Digital Sky Survey, spectroscopic observations, time-series photometry, and adaptive optics imaging of these binaries will address the following questions. 1) What is the intrinsic scatter of activity in low-mass dwarfs? 2) What is the activity of low-mass stars as a function of mass and time? 3) What is the absolute age-activity relationship in dMs? 4) What is the survival rate of wide binaries over time? 5) Do the components of wide binaries have the same close multiplicity statistics as low-mass stars not in wide systems?The project team has a joint program between Vanderbilt and Fisk Universities of education and research mentoring at the undergraduate, graduate, and postdoctoral levels, which significantly enhances and broadens the participation of underrepresented minorities in astronomy. The present research includes a plan to continue and expand upon the undergraduate and graduate programs. It also includes an excellent professional development opportunity for a postdoctoral researcher seeking experience integrating research and student mentoring.

AST-0909463 Stassun该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。M矮星（dMs）占银河系恒星的70%，其主序寿命比银河系的年龄还要长。 因此，它们是研究银河系结构和演化的有用探针。 低质量双星是检验经验关系的重要实验室，因为这两颗恒星可能是在同一时间由相同的物质形成的。 该项目将制作迄今为止最大的低质量宽双星样本，然后利用这一样本：（a）研究多重性在低质量恒星形成中的作用;（B）测试和校准质量-年龄-活动-旋转关系，这对确定恒星年龄至关重要，并用于确定系外行星主星的基本性质;（c）追踪银河系动力学相互作用的历史。 在斯隆数字巡天中识别所有宽低质量双星的基础上，对这些双星的光谱观测、时间序列测光和自适应光学成像将解决以下问题。 1)低质量矮星的活动的内在散射是什么？ 2)什么是低质量恒星的活动作为质量和时间的函数？ 3)什么是绝对的年龄与活动的关系在dMs？ 4)随着时间的推移，宽双星的存活率是多少？ 5)宽双星的组成部分是否与不在宽系统中的低质量恒星具有相同的接近多重统计？该项目小组在范德比尔特大学和菲斯克大学之间有一个联合项目，在本科生、研究生和博士后水平上提供教育和研究指导，这大大提高和扩大了代表性不足的少数民族在天文学方面的参与。 目前的研究包括一个计划，继续和扩大后，本科和研究生课程。 它还包括一个优秀的专业发展机会，为博士后研究人员寻求整合研究和学生辅导的经验。