RAVE: Galactic Evolution from the Radial Velocity Experiment

RAVE：来自径向速度实验的银河演化

• 批准号: 0908326
• 负责人: Rosemary Wyse
• 金额: $ 55.33万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908326&HistoricalAwards=false
• 关键词: RAVE; Galactic; Evolution; Radial; Velocity

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Dr Wyse will investigate the early phases of evolution of the Milky Way's thin disk and the formation of its thick disk by using stellar spectra from the Radial Velocity Experiment (RAVE). This survey uses a fiber-fed spectrograph on the 1.2-meter UK Schmidt Telescope to obtain spectra of 150 stars at a time. From these, she will measure the star's motion towards or away from us, and estimate its surface gravity and temperature, chemical abundances and stellar rotation. A graduate student will travel each year to Australia to make observations for RAVE. One student will study a sample that may represent the first stars in the Milky Way's disk; they will be selected from RAVE to have a low metal abundance (below one-tenth of the Sun's value), but to follow the near-circular orbits characteristic of disk stars. High-resolution spectra will be taken to obtain more precise chemical abundances. A second student will use the detailed pattern of element abundances to test whether these stars could have been born in satellite galaxies that were swallowed by the Milky Way, and to develop a model for early disk formation.This award will support two graduate students. The RAVE database will be a widely useful resource across the astronomical community. The collaboration will release its database in a form that is compliant with the standards of the Virtual Astronomical Observatory, making it accessible to the community.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。Wyse博士将利用径向速度实验（RAVE）的恒星光谱研究银河系薄盘演化的早期阶段及其厚盘的形成。 这次巡天使用了英国1.2米长的施密特望远镜上的光纤光谱仪，一次可以获得150颗恒星的光谱。 从这些数据中，她将测量星星朝向或远离我们的运动，并估计其表面重力和温度，化学丰度和恒星旋转。 一名研究生将每年前往澳大利亚为RAVE进行观察。 一名学生将研究一个可能代表银河系圆盘中第一批恒星的样本;他们将从RAVE中选择具有低金属丰度（低于太阳值的十分之一），但遵循圆盘恒星的近圆形轨道特征。 将采用高分辨率光谱，以获得更精确的化学丰度。 第二名学生将使用元素丰度的详细模式来测试这些恒星是否可能诞生于被银河系吞噬的卫星星系中，并开发早期盘形成的模型。该奖项将支持两名研究生。 RAVE数据库将成为天文学界广泛有用的资源。 该合作将以符合虚拟天文台标准的形式发布其数据库，使其可供社区使用。