Coordinated Global Time-Series Photometry of Variable Stars: The Whole Earth Telescope

变星的协调全球时间序列光度测量：全球望远镜

• 批准号: 9876655
• 负责人: Steven Kawaler
• 金额: $ 21.66万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9876655&HistoricalAwards=false
• 关键词: Coordinated; Global; Time; Series; Photometry

ABSTRACTKawaler, StevenAST-9876655The Whole Earth Telescope (WET) project coordinates over a dozen observatories around the world in observational campaigns to observe white dwarf stars. During a given international campaign, target stars are observed around-the-clock for several weeks. From these continuous records of photometric variability, many different frequencies of oscillation can be detected. Each is related directly to a given depth, opacity, density, and ionization state in the stellar interior. Analogous to earthquake studies of the Earth's interior, asteroseismology provides one of the few observational verifications of theoretical models of stellar interiors. Detailed analysis of the frequencies observed yields high precision cooling rates, composition and masses that are unachievable by any other means. This technique is being extended include hot subdwarfs, d Scuti variables, Ap stars and other unstable objects in late stages of evolution. The operational center of WET is being moved from Texas to Iowa.Funding for this project was provided by the NSF Stellar Astronomy & Astrophysics Program (SAA) and Division of International Programs (INT).

全球望远镜（WET）计划协调世界各地的十几个天文台对白色矮星进行观测。 在特定的国际活动中，对目标恒星进行数周的全天候观测。 从这些光度变化的连续记录中，可以检测到许多不同的振荡频率。 每一个都与恒星内部给定的深度、不透明度、密度和电离状态直接相关。 类似于地球内部的地震研究，星震学提供了对恒星内部理论模型的少数观测验证之一。 对所观察到的频率进行详细分析，可以获得任何其他方法都无法实现的高精度冷却速率、成分和质量。这项技术正在扩展到包括热亚矮星，d Scuti变星，Ap星和其他处于演化后期的不稳定天体。 WET的运行中心将从德克萨斯州搬到爱荷华州，该项目的资金由美国国家科学基金会恒星天文天体物理计划（SAA）和国际计划部（INT）提供。