Periodic Phenomena in Cataclysmic Binaries

灾难性双星中的周期性现象

• 批准号: 0908363
• 负责人: Joseph Patterson
• 金额: $ 19.59万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908363&HistoricalAwards=false
• 关键词: Periodic; Phenomena; Cataclysmic; Binaries

Dr. Joseph Patterson will lead a world-wide collaboration of professionals and amateurs to obtain continuing observations of cataclysmic variable stars. These objects consist of a white dwarf star with a close companion which is transferring mass onto the white dwarf via an accretion disk. These objects can exhibit large, irregular, and rapid changes in brightness (hence the term "cataclysmic"). Depending on the type of the companion and its proximity to the white dwarf, the system can have complicated changes in the amount of and spectrum of the emitted light, from which much can be learned about the nature of the accretion disk and the rate of mass transfer.Over the last ten years, Dr. Patterson has assembled a worldwide network of small photometric telescopes, called the Center for Backyard Astrophysics. Through this network, astronomers are able to study periodic phenomena in unprecedented detail. This network of (mostly) amateur astronomers is now a major element in the research interface of amateur and professional astronomers. During this project, new efforts will expand the observations beyond the realm of cataclysmic variables. This program represents a symbiosis of the amateur's traditional interest in discovery with the physicist's traditional interest in experiments leading to confrontation with theory. With the widespread closing of small telescopes at professional observatories, this type of collaboration is necessary for the continuing study of periodic and aperiodic phenomena in cataclysmic variables.

约瑟夫·帕特森博士将领导一个由专业人士和业余爱好者组成的世界范围的合作项目，以获得对激变变星的持续观测。这些天体由一颗白矮星和一颗近距离伴星组成，这颗恒星正在通过吸积盘将质量转移到白矮星上。这些物体的亮度会有很大的、不规则的、快速的变化(这就是术语“灾难”的由来)。根据伴星的类型和它与白矮星的距离，该系统可能会在发射的光量和光谱上发生复杂的变化，从中可以了解到许多关于吸积盘的性质和质量转移速度的信息。在过去的十年里，帕特森博士建立了一个由小型光度望远镜组成的全球网络，称为后院天体物理中心。通过这个网络，天文学家能够以前所未有的细节研究周期现象。这个由(大部分)业余天文学家组成的网络现在是业余天文学家和专业天文学家研究界面上的一个主要元素。在这个项目中，新的努力将把观测范围扩大到激变变数之外。这个项目代表了业余爱好者对发现的传统兴趣与物理学家对实验的传统兴趣的共生，导致了与理论的对抗。随着专业天文台的小望远镜的广泛关闭，这种类型的合作对于继续研究激变变星中的周期性和非周期性现象是必要的。