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

唐纳德·特恩德鲁普俄亥俄州立大学AST-9820603DR.俄亥俄州立大学的特恩德鲁普和天体物理进展的彼得森将开展一个合作项目，调查银河系凸起中的热星，这些恒星的温度超过2万K，被认为是在古老的富含金属的河外系统中发现的过量紫外线的来源。这些恒星是一个谜，因为这些恒星并不是在我们银河系的球状星团的富含金属的系统中发现的，而是显然在椭圆星系和其他螺旋星系的凸起中很常见。这次光度和光谱调查将对我们银河系隆起的几个区域进行完整的普查，在那里，初步工作已经发现了这些热星的一个具有统计学意义的样本，在那里可以获得足够大的富含金属的样本，以识别处于恒星演化短暂阶段的恒星。这项调查将确定每个相关演化阶段的恒星数量，并得出距离银河系中心不同距离的几个区域中温度足够低、不受扩散影响的恒星的金属含量。

Terndrup, DonaldOhio State University AST-9820603Drs. Terndrup, at the Ohio State University, and Peterson, of Astrophysical Advances, 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.