M Stars and the History of the Milky Way

M星和银河系的历史

• 批准号: 0807997
• 负责人: Jennifer Johnson
• 金额: $ 15.81万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-07-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0807997&HistoricalAwards=false
• 关键词: Stars; History; Milky; Way

Dr. Jennifer Johnson (Ohio State University) will develop an empirical calibration of moderate dispersion spectral indices (in the optical red region) for M-type giant and M-type dwarf stars. The M giants will be calibrated by observing stars with known chemical composition and colors or by comparing directly to previous studies of high-resolution spectra at various wavelengths. The M dwarfs will be calibrated by observing dwarfs in binary systems with a companion that is an F-, G-, or K-type star; the metallicity of the companion being applied to the M dwarf. The calibrations will be used to derive properties of M giants and dwarfs already observed by Sloan Extension for Galactic Understanding and Exploration (SEGUE) and the Two-Micron All-Sky Survey (2MASS), and additional observations will be made at the Large Binocular Telescope, the MDM observatory, and the Small and Moderate Aperture Research Telescope System in order to map the halo distribution of M giant stars. Results from the work can also be applied to Sloan Digital Sky Survey and United Kingdom Infrared Telescope Infrared Deep Sky Survey data in general for other studies. A graduate student and a postdoctoral researcher will take part in this research project. Undergraduate students will also be involved in some aspects of the research. Dr. Johnson and her collaborators will also be involved with the Ohio State University collaboration with the Columbus Science Museum (COSI) to perform public outreach in the area.

Jennifer Johnson博士（俄亥俄州立大学）将为m型巨星和m型矮星开发一种中等色散光谱指数（在光学红区）的经验校准方法。M巨星将通过观察已知化学成分和颜色的恒星或直接与先前研究的不同波长的高分辨率光谱进行比较来校准。M矮星将通过观测双星系统中的矮星来校准，伴星是F型、G型或k型恒星；伴星的金属丰度被应用于M矮星。这些校准将用于推导斯隆星系理解与探索扩展（SEGUE）和2微米全天巡天（2MASS）已经观测到的M颗巨星和矮星的性质，并将在大型双筒望远镜、MDM天文台和中小口径研究望远镜系统进行额外的观测，以绘制M颗巨星的晕分布。这项工作的结果也可以应用于斯隆数字巡天和英国红外望远镜的红外深空巡天数据，用于其他研究。本研究项目将有一名研究生和一名博士后参与。本科生也将参与研究的某些方面。约翰逊博士和她的合作者还将参与俄亥俄州立大学与哥伦布科学博物馆（COSI）的合作，在该地区进行公众宣传。