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Development, Operation and Maintenance of the Automated Plate Scanner

自动平板扫描仪的开发、操作和维护

基本信息

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

项目摘要

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.

在我们对两者的理解中，星系和恒星的演化是关于恒星的成分和演化可能取决于化学物质组成，初始质量函数的可能变化，星星的形成，特别是对形态类型的银河这里概述的研究计划将提供一些开始回答这些问题所需的观测数据问题. 具体来说，一个恒星的内容调查附近的Sb型螺旋星系M31将进行。 A的初步结果对M31中最亮的恒星的调查表明，它们比M31中的其他恒星要小。比Sc螺旋星系和麦哲伦星系中的对应物更明亮不规则星系第一次观察表明，最大质量恒星的演化可能取决于形态类型对星星形成区的研究在奇特的半人马座星系A中将完成。对非常明亮的超巨星的研究， Hertzsprung-Russell（HR）图中的上光度边界包括哈勃-桑德奇变量和冷却器超巨星，将被执行。定量光谱奇异A型超巨星的研究强氢线已经开始。这些恒星可能是在氦燃烧阶段演化出超巨星。他们的在HR图上的标识和位置非常重要用于恒星演化研究