Planetary Nebulae as Narrators of Stellar and Galactic Chemical Evolution: A New Probe of Galactochronology

行星状星云作为恒星和银河化学演化的叙述者：银河年代学的新探索

• 批准号: 9819123
• 负责人: Karen Kwitter
• 金额: $ 23.78万
• 依托单位: Williams College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819123&HistoricalAwards=false
• 关键词: Planetary; Nebulae; Narrators; Stellar; Galactic

ABSTRACTAST-9819123Kwitter, KarenThis project focuses on the spectroscopic determination of chemical abundances for planetary nebulae (PNe) as tracers of the chemical evolution of the Galaxy and yields of stellar nucleosynthesis. The objectives of the study include: (1) deriving the radial gradients of sulfur (S) and argon (Ar) across the disk of the Galaxy; (2) investigating the hypothesis that S and Ar can be used as tracers of Fe in stellar metallicity studies; (3) determination of the metallicity of the central star of PNe; (4) using the metallicities implied to test theoretical yields of nuclear processing in intermediate-mass stars; and (5) testing the reported abundance gradients within individual PNe. Some of the data for this study has already been collected. New high-resolution spectroscopic data will be obtained at the Apache Point Observatory and elsewhere, as required.

Kwitter，Karen该项目的重点是行星状星云（PNe）化学丰度的光谱测定，作为银河系化学演化和恒星核合成产额的示踪剂。 本研究的主要目的是：（1）推导银河系盘面上硫（S）和氩（Ar）的径向梯度，（2）探讨S和Ar可作为Fe示踪剂用于恒星金属丰度研究的假设，（3）确定PNE中心星星的金属丰度，（4）确定PNE中心恒星的金属丰度。（4）使用暗示的金属丰度来测试中等质量恒星核处理的理论产额;（5）测试个别PNe内报告的丰度梯度。 这项研究的一些数据已经收集。 阿帕奇角天文台和其他地方将视需要获得新的高分辨率光谱数据。