Development, Operation and Maintenance of the Automated Plate Scanner

自动平板扫描仪的开发、操作和维护

• 批准号: 8714579
• 负责人: Roberta Humphreys
• 金额: $ 25.84万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-02-01 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8714579&HistoricalAwards=false
• 关键词: Development; Operation; Maintenance; Automated; Plate

Among the basic uncertainties in our understanding of both galactic and stellar evolution are questions concerning how the stellar content and evolution of the stars may depend on chemical composition, possible variations in the initial mass function of star formation, and especially on the morphological type of the galaxy. The research program outlined here will provide some of the observational data necessary to begin answering these questions. Specifically, a stellar content survey of the nearby Sb-type spiral galaxy M31 will be carried out. The initial results of a survey of the brightest stars in M31 show that they are less luminous than their counterparts in Sc spirals and the Magellanic irregular galaxies. This first look suggests that the formation and evolution of the most massive stars may depend on the morphological type. An investigation of the star forming regions in the peculiar galaxy Centaurus A will be done. Studies of the very luminous hypergiant stars, which define the upper luminosity boundary in the Hertzsprung-Russell (HR) diagram and includes the Hubble-Sandage variables and the cooler hypergiants, will be carried out. A quantitative spectroscopic study of the peculiar A-type supergiant stars with anomalously strong hydrogen lines has begun. These stars may be the more evolved supergiant stars in the Helium burning stage. Their identification and location on the HR diagram is very important for stellar evolution studies.

在我们对银河系和恒星进化的理解中的基本不确定性中，关于恒星的恒星含量和演变如何取决于化学成分，恒星形成的初始质量功能的可能变化，尤其是星系的形态类型。 此处概述的研究计划将提供一些开始回答这些问题所需的观察数据。 具体而言，将对附近的SB型螺旋星系M31进行出色的内容调查。 对M31中最亮恒星的调查的最初结果表明，它们在SC螺旋和麦哲伦不规则星系中的发光效果不如其发光。 这首歌表明，最大恒星的形成和演变可能取决于形态类型。 将对对奇特的星系半人马座中的恒星形成区域进行调查。 将对Hertzsprung-Russell（HR）图中的上部光度边界（HR）图中的上亮度边界进行的非常发光的超级巨星的研究进行研究，并包括哈勃式变量和较酷的超级巨人。 对具有异常强氢系的特殊A型超级恒星的定量光谱研究已经开始。 在氦气燃烧阶段，这些恒星可能是更具进化的超级恒星。他们在人力资源图上的识别和位置对于恒星进化研究非常重要。