Collaborative Proposal: SdB Binary Period and Mass Distributions from Precise Radial Velocities

绿色，伊丽莎白AST 97-31655 在一项合作努力中，亚利桑那大学的PI绿色和利伯特以及维拉诺瓦大学的PI萨弗将研究亚矮星B星之间的双星系统的特征，这种场对应于在星团中发现的扩展和蓝色水平分支星。 他们将利用精确的新径向速度观测资料，调查双星的频率以及双星系统各组成部分的轨道参数和质量的分布。 这项研究的最终目标是更好地了解亚矮星B的起源，这是在巡天中发现的大多数非常蓝色的天体，是在外部星系中观察到的紫外线过度的一个重要因素，并以此类推，了解在星团中看到的蓝色和延伸的水平分支恒星的起源。 ***

Green, Elizabeth AST 97-31655 In a collaborative effort, PIs Green and Liebert of the University of Arizona and PI Saffer of Villanova University will investigate the characteristics of binary systems among subdwarf B stars, the field counterparts to the extended and blue horizontal branch stars found in clusters. Using precise new radial velocity observations, they will investigate the frequency of binaries and the distribution of orbital parameters and masses of components of the binary systems. The ultimate goals of the research are to understand better the origin of subdwarf B stars, which make up the majority of very blue objects found in sky surveys and are an important contributor to the UV excesses observed in external galaxies, and, by analogy, the origin of the blue and extended horizontal branch stars seen in clusters. ***