Halo Stars: Stellar Rotation, Planets (?), and Ages

AST 0305431 PI：布鲁斯研究机构：北卡罗来纳州大学，教堂山博士。布鲁斯卡尼将与州立大学鲍林绿色分校的约翰莱尔德合作，开展一系列旨在更好地了解银河系恒星种群的项目。 他们将在四个广泛的领域开展研究活动：1）跟踪他们最近的观测结果，这些观测结果表明，旋转的红色水平分支和红巨星分支恒星的比例惊人地高，这可能与行星吸积有关，2）探索双星的质量-光度关系，以限制恒星氦丰度，3）研究贫金属亚巨星，以细化金属丰度和确定年龄，4）研究局部G矮星，以调查太阳附近薄盘和厚盘种群的化学和动力学演化，以及它们的完整金属丰度分布函数，后续研究将提供元素与铁的比例作为[Fe/H]的函数的详细信息。本科生和研究生将参与这项研究。 PI计划通过定期课程的团队教学提高他们的教学技能，扩大对研究生的指导，并扩大Morehead天文馆的实践推广活动。 学生们还将参与远程使用4米SOAR望远镜。

AST 0305431PI: Bruce CarneyINSTITUTION: University of North Carolina, Chapel HillDr. Bruce Carney, in collaboration with John Laird of Bowling Green State University, will carry out a suite of projects that are aimed at developing a better understanding of the stellar populations in our galaxy. They will pursue research activities in four broad areas: 1) following up on their recent observations that suggest that the surprisingly high fraction of field red horizontal branch and red giant branch stars that rotate may be linked to planet accretion, 2) the exploration of the mass-luminosity relationship for binary stars to constrain the stellar helium abundance, 3) a study of metal-poor subgiant stars to refine metallicities and determine ages, and 4) a study of local G dwarfs to investigate the chemical and dynamical evolution of the thin and thick disk populations in the solar neighborhood, and their full metallicity distribution functions, from which follow-up studies will provide details on the element-to-iron ratios as a function of [Fe/H].Undergraduate and graduate students will be involved in the research. The PI plans to expand the mentoring of graduate students through improvement of their teaching skills through team teaching of regular courses and to expand the hands-on outreach activities at Morehead Planetarium. Students at UNC will also be involved with remote use of the 4-meter SOAR telescope.