The Origins and Binary Properties of Subdwarf B Stars

亚矮星 B 星的起源和双星特性

• 批准号: 0098699
• 负责人: Elizabeth Green
• 金额: $ 9.99万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-15 至 2005-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0098699&HistoricalAwards=false
• 关键词: Origins; Binary; Properties; Subdwarf; Stars

Green, Elizabeth" The Origins and Binary Properties of Subdwarf B Stars "AST- 0098699Subdwarf B stars are among the brightest of highly evolved stars. The suggested binary star origin for most of them becomes important in several diverse areas of contemporary astrophysics ranging from stellar population studies in external galaxies to the common envelope evolution in interacting binary stars. This award is for continuing work in obtaining the remaining observations necessary for determining the binary properties and for comparing these properties with theoretical expectations. An extensive spectroscopic program is planned using University of Arizona observing facilities. Most studies to date concern binary stars with the largest velocity amplitude. To fully understand the range of possible orbital parameters, the new observations will be directed towards a kinematically unbiased sample. Once the orbital ephemerides are known, precise photometric monitoring will be carried out in order to search for eclipses, reflection effects and ellipsoidal variations that will put additional constraints on the binary star parameters.

绿色，伊丽莎白”亚矮星B星的起源和双星性质“AST-0098699亚矮星B星是高度进化的恒星中最亮的。建议的大部分双星星星起源在当代天体物理学的几个不同领域变得重要，从外部星系的恒星种群研究到相互作用双星的共同包络演化。该奖项是为了继续获得确定二元性质所需的剩余观测结果，并将这些性质与理论预期进行比较。一个广泛的光谱计划计划使用亚利桑那大学的观测设施。迄今为止，大多数研究关注的是具有最大速度振幅的双星。为了充分了解可能的轨道参数的范围，新的观测将针对运动学上无偏的样本。一旦知道了轨道星历，将进行精确的光度监测，以便寻找对双星星星参数施加额外限制的日食、反射效应和椭球变化。