Collaborative Research: The 3-Helium Problem
合作研究:3-氦问题
基本信息
- 批准号:0098047
- 负责人:
- 金额:$ 18万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2001
- 资助国家:美国
- 起止时间:2001-07-01 至 2006-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Bania, Thomas" Collaborative Research: The 3- Helium Problem "AST- 0098047Determination of the isotopic abundances of the light elements is fundamental in probing the earliest nucleosynthesis in our universe. During the first 1000 seconds, significant amounts of light elements 2-H, 3-He, 4-He and 7-Li were produced. This investigation focuses on the 3-He isotope. A primordial abundance is an ultimate aim but the contribution by the generation of this isotope by nuclear burning within common solar-type stars must first be evaluated. We would expect the contamination from this component to increase with time and also to be larger in areas which have had the highest rates of star formation in the past. These correlations are not seen and a prime goal of the present proposal is to understand why they are absent. The plan is to continue a survey of planetary nebulae and H II regions to determine 3-He abundances in different parts of the galaxy. Earlier work had revealed that small but significant excesses of 3-He were present in the planetary nebula NGC 3242 showing that enrichment had taken place. With improved facilities at Arecibo and Green Bank, it is expected that many more objects can be observed now.
Bania,托马斯”合作研究:3-氦问题“AST-0098047测定轻元素的同位素丰度是探索宇宙中最早的核合成的基础。在最初的1000秒内,产生了大量的轻元素2-H、3-He、4-He和7-Li。 本研究的重点是3-He同位素。原始丰度是最终目标,但必须首先评估普通太阳型恒星内核燃烧产生这种同位素的贡献。我们预计这种成分的污染会随着时间的推移而增加,而且在过去星星形成率最高的地区也会更大。这些相关性是看不到的,本提案的主要目标是了解为什么它们不存在。计划是继续对行星状星云和H II区域进行调查,以确定银河系不同部分的3-He丰度。早期的工作显示,行星状星云NGC 3242中存在少量但显著过量的3-He,表明已经发生了浓缩。随着阿雷西博和绿色银行设施的改进,预计现在可以观测到更多的物体。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Thomas Bania其他文献
Thomas Bania的其他文献
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{{ truncateString('Thomas Bania', 18)}}的其他基金
Probing the Milky Way Disk with Massive Stars
探索拥有大质量恒星的银河系盘
- 批准号:
1714688 - 财政年份:2017
- 资助金额:
$ 18万 - 项目类别:
Standard Grant
Galactic Chemical Evolution: The 3-Helium Problem
银河化学演化:3-氦问题
- 批准号:
0707853 - 财政年份:2007
- 资助金额:
$ 18万 - 项目类别:
Continuing Grant
Collaborative Project: The 3-Helium Problem
合作项目:3-氦问题
- 批准号:
9731484 - 财政年份:1998
- 资助金额:
$ 18万 - 项目类别:
Standard Grant
Steps Toward the Cosmic Abundance of 3-Helium
迈向宇宙丰富的 3-氦的步骤
- 批准号:
9121169 - 财政年份:1992
- 资助金额:
$ 18万 - 项目类别:
Continuing Grant
Astrophysical Studies of Galactic Structure and the Interstellar Medium
星系结构和星际介质的天体物理研究
- 批准号:
8511844 - 财政年份:1986
- 资助金额:
$ 18万 - 项目类别:
Standard Grant
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