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

AST 0305431PI：Bruce Carney Instantation：北卡罗来纳大学，教堂山博士。布鲁斯·卡尼将与鲍林格林州立大学的约翰·莱尔德合作开展一系列项目，旨在更好地了解银河系中的恒星人口。他们将在四个主要领域开展研究活动：1)跟进他们最近的观测，这些观测表明，场域红水平分支和红巨星中旋转的高比例恒星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提炼金属丰度并确定年龄；4)研究局部G矮星，以研究太阳附近薄盘和厚盘的化学和动力学演化，以及它们的全金属丰度分布函数。随后的研究将提供元素铁比随[Fe/H]变化的详细情况。本科生和研究生将参与这项研究。国际天文台计划通过定期课程的团队教学提高研究生的教学技能，从而扩大对他们的指导，并扩大在莫尔黑德天文馆的实践外联活动。北卡罗来纳大学的学生还将参与远程使用这台4米高的高空望远镜。

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.