The Origins and Binary Properties of Subdwarf B Stars

亚矮B星是高度演化的恒星中最亮的恒星之一。其中大多数双星的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。这一奖项是为了奖励在获得确定双星性质所需的剩余观测数据以及将这些性质与理论预期进行比较方面的持续工作。利用亚利桑那大学的观测设施，一个广泛的光谱项目正在计划中。迄今为止，大多数研究关注的是速度振幅最大的双星。为了充分了解可能的轨道参数范围，新的观测将指向一个运动学无偏的样本。一旦知道了轨道星历表，将进行精确的光度监测，以寻找日食、反射效应和椭球面变化，这些将对双星参数施加额外的限制。

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.