Periodic Phenomena and Evolution in Cataclysmic Binaries

灾难性双星的周期性现象和演化

• 批准号: 2205783
• 负责人: Joseph Patterson
• 金额: $ 17.32万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2205783&HistoricalAwards=false
• 关键词: Periodic; Phenomena; Evolution; Cataclysmic; Binaries

Principal Investigator (PI) Patterson leads the Center for Backyard Astrophysics (CBA), a worldwide collaboration between amateur and professional astronomers to monitor Cataclysmic Variables (CVs). CVs are two stars in a tight orbit, one star is a white dwarf (WD) and the other is a star similar to our sun. The WD steals material from the outer layers of its companion causing rapid and varying changes in the observed brightness. The amateur astronomers coordinate their efforts to monitor the CVs throughout the year and conduct intense observing campaigns during outbursts to further our understanding of these complex binary star systems. The CBA is a well-established group and will continue to provide precise photometric orbital and disk precession periods, and accurate data on flickering and outbursts for approximately 120 CVs. The members coordinate observations from a wide range of longitude to ensure near day-long coverage of CVs during outbursts. The concerted team effort and dedication over the past 25 years has resulted in over 150 publications. A major result was the discovery of superhump signals from SU Uma-type dwarf novae. The superhump may be caused by periodic tidal stressing of the WD disk and the team will continue their investigation of these strange phenomena.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.

首席研究员(PI)帕特森领导着后院天体物理中心(CBA)，该中心是业余天文学家和专业天文学家之间的全球合作，以监测灾变变量(CV)。CVS是在紧密轨道上的两颗恒星，一颗是白矮星(WD)，另一颗是类似太阳的恒星。WD从其伴星的外层窃取物质，导致观测到的亮度迅速变化。业余天文学家协调他们的努力，全年监测CVS，并在爆发期间进行密集的观测活动，以加深我们对这些复杂的双星系统的了解。CBA是一个久负盛名的组织，将继续提供精确的光度学轨道和圆盘进动周期，以及大约120个CV的闪烁和爆发的准确数据。成员们在广泛的经度范围内协调观察，以确保在爆发期间几乎一天都能覆盖简历。在过去的25年里，团队的共同努力和奉献导致了150多种出版物的出版。一个主要的结果是发现了来自Su Uma型矮新星的超峰信号。超驼峰可能是由WD盘周期性的潮汐压力引起的，团队将继续调查这些奇怪的现象。这一裁决反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。