Brown Dwarfs and Very Low Mass Stars

褐矮星和极低质量恒星

• 批准号: 9618439
• 负责人: Gibor Basri
• 金额: $ 24万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-03-15 至 2001-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9618439&HistoricalAwards=false
• 关键词: Brown; Dwarfs; Very; Low; Mass

Basri, Gibor AST 96-18439 Dr. Basri will carry out an observational study of the properties of brown dwarfs and very low-mass stars. His study is timely and important in light of the recent discoveries of very low mass companions to other stars. His research plan has 3 primary objectives : 1) to search for brown dwarfs in the Pleiades star cluster and to use them to estimate the brown dwarf mass fraction and to establish the "lithium age" of the cluster in conjunction with stellar models, 2) to explore the relation between rotational velocity and activity in late M stars, and 3) to improve model atmospheres for very cool main-sequence stars through the use of atmospheric diagnostics provided by high- resolution spectroscopy. The proposed array of topics take advantage of the observational facilities at Keck and at Lick, to which the PI has access. ***

Basri博士将对褐矮星和低质量恒星的特性进行观测研究。鉴于最近发现的其他恒星的质量非常低的伴星，他的研究是及时和重要的。他的研究计划有3个主要目标：1)在昴宿星团中寻找褐矮星，并利用它们来估计褐矮星的质量分数，并结合恒星模型建立该星团的“锂年龄”；2)探索M后期恒星的旋转速度与活动之间的关系；3)通过使用高分辨率光谱提供的大气诊断来改进非常冷的主序星的大气模型。所提出的一系列课题利用了PI可以使用的凯克和利克的观测设施。＊＊＊