Observational and Laboratory Studies of the Evolution of Circumstellar Material
星周物质演化的观测和实验室研究
基本信息
- 批准号:2307305
- 负责人:
- 金额:$ 39.6万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2023
- 资助国家:美国
- 起止时间:2023-09-01 至 2026-08-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Mass loss from circumstellar envelopes in the late stages of stellar evolution is a major avenue by which the interstellar medium (ISM) becomes enriched in gas, dust, and heavy elements. This research project will investigate the gas phase molecular content of stellar ejecta, from asymptotic giant branch (AGB) stars to protoplanetary nebule (PPNe) and planetary nebulae (PNe). The investigators will extend their ongoing program of radio astronomical observations and laboratory measurements to characterize the molecular inventory and physical properties of these objects. Results from the project will allow astronomers to understand the nature of stellar ejecta and their influence on the diffuse ISM. The project will train graduate and undergraduate students in advanced techniques of radio astronomy and laboratory astrophysics.This research program seeks to elucidate how molecular material evolves from the AGB phase, through the intermediate PPNe phase, to the advanced PNe phase. To accomplish this, the investigators will undertake: (1) a better assessment of the carbon budget and isotope ratios through an extensive analysis of a highly sensitive broadband millimeter-wave survey of the carbon-rich envelope of the AGB star IRC+10216; (2) laboratory measurements of the rotational spectra of new metal-bearing carbides in the radio band to aid their identification in circumstellar envelopes; (3) an analysis of high spatial resolution images of the oxygen-rich envelope of VY Canis Majoris in a variety of molecules to understand the influence of the C/O ratio; and (4) evaluation of the molecular and isotopic composition of a diverse sample of carbon-rich and oxygen-rich PPNe and PNe by radio astronomical observations. A better understanding of the nature of the stellar ejecta, particularly PNe, would also advance our understanding of how they enrich the diffuse ISM.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
在恒星演化的后期,星周包层的质量损失是星际介质(ISM)富含气体、尘埃和重元素的主要途径。本研究项目将调查恒星喷出物的气相分子含量,从渐近巨星分支(AGB)恒星到原行星状星云(PPNe)和行星状星云(PNe)。 研究人员将扩大他们正在进行的射电天文观测和实验室测量计划,以表征这些物体的分子清单和物理特性。 该项目的结果将使天文学家了解恒星喷出物的性质及其对弥漫ISM的影响。 该项目将培养研究生和本科生射电天文学和实验室天体物理学的先进技术。该研究计划旨在阐明分子材料如何从AGB阶段,通过中间PNe阶段,到高级PNe阶段的演变。 为了实现这一目标,研究人员将开展以下工作:(1)通过对AGB星星IRC+10216富碳包层的高灵敏度宽带毫米波测量进行广泛分析,更好地评估碳收支和同位素比率;(2)在无线电波段对新的含金属碳化物的旋转光谱进行实验室测量,以帮助在星周包层中识别它们;(3)分析大犬座VY的富氧包层的各种分子的高空间分辨率图像,以了解C/O比的影响;(4)通过射电天文观测评估富碳和富氧PNe和PNe的各种样品的分子和同位素组成。 更好地了解恒星喷出物的性质,特别是PNE,也将推进我们对它们如何丰富弥散ISM的理解。该奖项反映了NSF的法定使命,并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。
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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Lucy Ziurys其他文献
Lucy Ziurys的其他文献
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{{ truncateString('Lucy Ziurys', 18)}}的其他基金
Advancing Our Knowledge of the Transition Metal-Carbon Bond: Integrating Spectroscopy and Theory
增进我们对过渡金属-碳键的了解:光谱学和理论的结合
- 批准号:
2154121 - 财政年份:2022
- 资助金额:
$ 39.6万 - 项目类别:
Standard Grant
Following the Molecular History of Stellar Ejecta: Combining Observations with Laboratory Spectroscopy and Imaging
追踪恒星喷射物的分子历史:将观测与实验室光谱和成像相结合
- 批准号:
1907910 - 财政年份:2019
- 资助金额:
$ 39.6万 - 项目类别:
Standard Grant
Probing the Metal-Carbon Bond: High Resolution Spectroscopy of Grignard Reagents and 3d Metal Carbon Clusters
探测金属-碳键:格氏试剂和 3d 金属碳簇的高分辨率光谱
- 批准号:
1565765 - 财政年份:2016
- 资助金额:
$ 39.6万 - 项目类别:
Continuing Grant
Following the Chemical History of Stellar Ejecta through Molecular Observations and Laboratory Spectroscopy
通过分子观测和实验室光谱学追踪恒星喷射物的化学历史
- 批准号:
1515568 - 财政年份:2015
- 资助金额:
$ 39.6万 - 项目类别:
Standard Grant
MRI: Development of a State-of-the-Art Multiband Receiver for Arizona Radio Observatory's New ALMA Antenna
MRI:为亚利桑那射电天文台的新型 ALMA 天线开发最先进的多频段接收器
- 批准号:
1531366 - 财政年份:2015
- 资助金额:
$ 39.6万 - 项目类别:
Standard Grant
Investigating the Chemistry of Circumstellar Material through Millimeter-wave Observations and Laboratory Spectroscopy
通过毫米波观测和实验室光谱研究星周材料的化学
- 批准号:
1211502 - 财政年份:2012
- 资助金额:
$ 39.6万 - 项目类别:
Continuing Grant
The Arizona Radio Observatory: Surveying the ISM through Millimeter and Sub-millimeter Spectroscopy
亚利桑那射电天文台:通过毫米波和亚毫米波谱仪调查 ISM
- 批准号:
1140030 - 财政年份:2012
- 资助金额:
$ 39.6万 - 项目类别:
Continuing Grant
High-Resolution Spectroscopy of 3d Metal-Containing Compounds: Insights into Bond Activation, Catalysis, and Synthesis
3d 含金属化合物的高分辨率光谱:深入了解键活化、催化和合成
- 批准号:
1057924 - 财政年份:2011
- 资助金额:
$ 39.6万 - 项目类别:
Continuing Grant
A Sideband-Separating Receiver at 385-500 GHz: Advancing Spectroscopic Frontiers at Sub-Millimeter Wavelengths
385-500 GHz 的边带分离接收器:推进亚毫米波长的光谱前沿
- 批准号:
0905288 - 财政年份:2009
- 资助金额:
$ 39.6万 - 项目类别:
Standard Grant
Following Refractory Elements from Circumstellar Ejecta to the Interstellar Medium: A Combined Laboratory and Observational Study
追踪从星周喷射物到星际介质的难熔元素:实验室和观测相结合的研究
- 批准号:
0906534 - 财政年份:2009
- 资助金额:
$ 39.6万 - 项目类别:
Standard Grant
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