RR Lyrae Stars and the Oosterhoff Dichotomy

天琴座 RR 星和奥斯特霍夫二分法

• 批准号: 9986943
• 负责人: Horace Smith
• 金额: $ 13.5万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9986943&HistoricalAwards=false
• 关键词: RR; Lyrae; Stars; Oosterhoff; Dichotomy

Smith, Horace"RR Lyrae Stars & the Oosterhoff Dichotomy"AST-9986943Dr. Smith proposes to investigate the reasons why two groups of RR Lyrae stars exist among globular clusters (the so-called "Oosterhoff Dichotomy"). Such stars are the primary distance standard for Population II stars and clusters. The proposed work will therefore contribute directly to elucidating the nature of the accelerating universe. A photometric and spectroscopic program will be undertaken in order to determine the physical parameters such as metallicity that are suspected to correlate with Oosterhoff's group membership. In addition to this main focus, Dr. Smith will also examine the modulation of the shape and amplitude of RR Lyrae light curves (Blazhko effect).Funding for this project was provided by the NSF program for Stellar Astronomy & Astrophysics (AST/SAA).

史密斯（Smith），霍拉斯（Horace）“ RR Lyrae Stars和Oosterhoff二分法” AST-9986943DR。史密斯提出要调查球状簇中存在两组RR Lyrae恒星的原因（所谓的“ Oosterhoff二分法”）。 这样的恒星是人口II恒星和簇的主要距离标准。 因此，拟议的工作将直接有助于阐明加速宇宙的性质。 将进行一项光度和光谱程序，以确定物理参数（例如金属性），这些参数被怀疑与Oosterhoff的组成员资格相关。 除了这一主要重点外，史密斯博士还将检查RR Lyrae光曲线的形状和振幅的调节（Blazhko效应）。该项目的资金由NSF计划提供了恒星天文学和天体物理学（AST/SAA）。