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High Galactic Latitude Cataclysmic Variables:

高银河纬度灾难性变量：

基本信息

批准号：
8914866
负责人：
Steven Howell
金额：
$ 5.97万
依托单位：
Leidos, Inc.
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1990
资助国家：
美国
起止时间：
1990-01-01 至 1992-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8914866&HistoricalAwards=false
关键词：
Galactic Latitude Cataclysmic Variables

项目摘要

Cataclysmic variables (CVs) are stellar systems that are characterized by sudden brightness changes. They include novae and nova-like variables. All CVs are close binary stars, consisting of a compact object, usually a white dwarf, and a red star. CVs are found among the disk and the halo population of stars in our Galaxy. The Principal Invsetigators* (PIs) propose to observe photo- metrically and spectroscopically 40 to 50 CVs that are candidate members of the halo population of our galaxy. The chief observing tool will be two-dimensional charge-coupled devices (CCDs), which will allow accurate photometric studies despite the objects' extreme faintness. The goal of this research is to determine the orbital and physical properties of halo CVs and to compare them with data of galactic disk CVs. The results of this observational program and of other CV systems already in the literature should provide information on how age, chemical composition, and parent population affect the formation of binary stars and, in particular, CVs. The PIs expect to be able to choose between conflicting theories on the properties and formation of CVs. *This proposal is one of three identical proposals, each with its own budget, submitted by Principal Investigators (PIs) from three different institutions. The other PIs are Joseph Patterson of Columbia University (NSF Proposal 8916995) and Paula Szkody of the University of Washington (8915445).

激变变星（Cataclysmic Variables，CV）是一种恒星系统，以突然的亮度变化为特点。其中包括新星和类新星变星所有的CV都是近距离双星，由一个紧密的物体组成，通常是一个白色矮星，和一个红色的星星。 CV被发现之间的磁盘和晕人口银河系中的恒星首席调查员 * 建议观察照片- 从光谱和光谱上看，有40到50个CV是候选人我们银河系的晕圈成员首席观察员工具将是二维电荷耦合器件（CCD），将允许精确的光度研究，极度虚弱本研究的目标是确定晕轮CV的轨道和物理性质，并比较它们星系盘CV的数据。这个观测项目和其他CV系统的结果已经在文献中应该提供关于年龄，化学成分和母体种群影响形成尤其是CV 私家侦探们希望能够在关于这些特性的相互冲突的理论之间做出选择， CV的形成。 * 本提案是三个相同提案之一，每个提案都有其由三名主要研究员提交的自己的预算不同的机构。其他PI是约瑟夫帕特森的哥伦比亚大学（NSF提案8916995）和华盛顿大学（8915445）。