Modelling Integrated Spectra of Globular Clusters in M31 andthe Galaxy

M31 和星系中球状星团的综合光谱建模

• 批准号: 8921167
• 负责人: Roger Bell
• 金额: $ 12.7万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-15 至 1992-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8921167&HistoricalAwards=false
• 关键词: Modelling; Integrated; Spectra; Globular; Clusters

Globular clusters are well studied systems, because they offer the opportunity to look on a large number of stars of different masses, all with pretty much the same age and initial chemical composition. Much of our knowledge of stellar evolution comes from the study of these systems. However, we can, as yet only really look at individual stars in very nearby objects, those associated with our own galaxy, or with the Magellanic Clouds. This program is an attempt to enable us to obtain accurate information about the chemical composition and age of much more distant globular clusters. The investigators combine internationally recognized expertise in the fields of the theory of stellar atmospheres, spectroscopy and the study of globular clusters. They will utilize computation of model stellar atmospheres, stellar evolution calculations, and various luminosity functions and ages to predict integrated spectra which can be measured for distant objects. They will calibrate their model parameters with data from nearby globular clusters for which these parameters have been determined by other means.

球状星团是研究得很好的系统，因为它们提供了 有机会观察大量不同质量的恒星， 年龄和初始化学成分都差不多 我们对恒星演化的大部分知识都来自于对 这些系统。 然而，我们目前只能看到 在非常接近的物体中的单个恒星，那些与我们的 自己的星系，或与麦哲伦云。 本程序试图使我们能够获得准确的 关于化学成分和年龄的信息 遥远的球状星团 调查人员联合收割机 国际公认的理论领域的专业知识 恒星大气、光谱学和球状星团的研究 集群 他们将利用模型恒星的计算 大气、恒星演化计算和各种光度 函数和年龄来预测综合光谱， 测量远处的物体。 他们将校准他们的模型 参数与来自附近球状星团的数据， 参数由其他方法确定。