The Evolution of Massive Stars as a Function of Metallicity: Closing the Loop Observationally in the Local Group

大质量恒星的演化作为金属丰度的函数：在本地群中观测闭合环路

• 批准号: 0093060
• 负责人: Philip Massey
• 金额: $ 23.55万
• 依托单位: Lowell Observatory
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0093060&HistoricalAwards=false
• 关键词: Evolution; Massive; Stars; Function; Metallicity

"The Evolution of Massive Stars as a Function of Metallicity: Closing the Loop Observationally in the Local Group"AST- 0093060Although massive stars are rare, they have an importance far beyond their scant numbers. Through action of their strong outflowing winds and their eventual explosive destruction as supernovae, they provide much of the energy input into the interstellar medium. With short lifetimes of only a few million years and high mass-loss rates, they are primary sources of heavy element enrichment in a galaxy. Dr. Massey is presently concluding a survey for red supergiant, blue supergiant and Wolf-Rayet stars in nearby galaxies of the Local Group. This project is scheduled for completion during the current calendar year. Follow-up observations are now required and, during the period covered by this new award, stars found in the survey will be observed with large telescopes to obtain spectra and photometry. It will be possible to learn how the evolution of massive stars varies with mass, age and heavy element content without the observational biases that have plagued this type of investigation in the past.

“大质量恒星的演化作为金属丰度的函数：在本地星群中观测闭合环路”AST-0093060虽然大质量恒星很罕见，但它们的重要性远远超出了它们的数量。通过它们强烈的外流风的作用以及最终作为超新星的爆炸性破坏，它们为星际介质提供了大量的能量输入。它们的寿命只有几百万年，质量损失率很高，是星系中重元素富集的主要来源。梅西博士目前正在完成一项对本星系群附近星系中的红超巨星、蓝超巨星和沃尔夫-拉叶星的调查。该项目计划于本日历年内完成。现在需要进行后续观测，在这个新奖项涵盖的期间，将用大型望远镜观测调查中发现的恒星，以获得光谱和光度测量。我们将有可能了解大质量恒星的演化如何随质量、年龄和重元素含量的变化而变化，而不会出现过去困扰此类研究的观测偏差。