Collaborative Project: A Comprehensive Survey of Hot Stars in the Galactic Bulge

合作项目：对银河核核中的热恒星进行全面调查

• 批准号: 9900582
• 负责人: Ruth Peterson
• 金额: --
• 依托单位: Astrophysical Advances
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-05-15 至 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9900582&HistoricalAwards=false
• 关键词: Collaborative; Project; Comprehensive; Survey; Hot

Peterson, RuthAstrophysical AdvancesAST-9900582Drs. Peterson, of Astrophysical Advances, and Terndrup, at the Ohio State University, will carry out a collaborative project to survey the Galactic bulge for hot stars, those with temperatures in excess of 20,000 K, that are thought to be the source of the excess Ultraviolet light found in old, metal-rich extragalactic systems. These stars have presented a puzzle, since such stars are not found in the metal-rich systems of globular clusters in our galaxy, yet are apparently common in elliptical galaxies and the bulges of other spiral galaxies. This photometric and spectroscopic survey will take a complete census of several fields in the bulge of our galaxy, where preliminary work has uncovered a statistically significant sample of these hot stars, and where large enough samples of a metal-rich population can be obtained to identify stars in short-lived phases of stellar evolution. The survey will identify the numbers of stars in each relevant evolutionary phase and derive metallicities for stars cool enough to be unaffected by diffusion, in several fields at varying distances from the Galactic center.

彼得森（Peterson），Ruthastrophysical Advancesast-9900582DRS。俄亥俄州立大学的天体物理进步的彼得森（Peterson）和Terndrup将进行一个协作项目，以调查热星的银河系凸起，那些温度超过20,000 K的人，被认为是旧的，金属富含金属富的外层状系统中过多的紫外线的来源。这些恒星呈现出一个难题，因为在我们星系中的球状簇的金属富含金属系统中未发现这样的恒星，但显然在椭圆星系和其他螺旋星系中很常见。这项光度和光谱调查将对我们的银河系凸起的几个领域进行完整的人口普查，在我们的银河系中，初步工作已经发现了这些热星的统计学意义样本，并且可以获得足够大的金属种群样本，以鉴定出恒星进化的短期阶段中的恒星。该调查将在每个相关进化阶段中识别恒星的数量，并在距银河系中心不同距离的几个田间中得出足够冷却的恒星的金属度。