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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

基本信息

批准号：
1907910
负责人：
Lucy Ziurys
金额：
$ 62.49万
依托单位：
University of Arizona
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1907910&HistoricalAwards=false
关键词：
Following Molecular History Stellar Ejecta

项目摘要

Mass loss from stars in the late stages of evolution is a major avenue by which the interstellar medium gets enriched in gas, dust, and heavy elements. This research project will investigate the nature of the material ejected by evolved stars and planetary nebulae. Results from the study will allow astronomers to understand how the physical and chemical properties of stars in late stages of evolution influence the lifecycle of material in the interstellar medium. This project will train graduate and undergraduate students, including ones from groups that are underrepresented in science, in advanced techniques of radio astronomy and laboratory astrophysics research. The research team will undertake a combined program of astronomical observations, laboratory experiments, and chemical modeling to explore the nature of stellar ejecta in the gas phase and in dust grains, and its impact on the diffuse interstellar medium. They will conduct molecular spectral line observations of circumstellar envelopes and planetary nebulae using ground-based single-aperture and interferometric radio telescopes. To complement and guide the observations, they will measure laboratory rotational spectra of metal-bearing molecules postulated to be important in carbon-rich and oxygen-rich envelopes of evolved stars. They will perform transmission electron microscopic imaging of carbon and silicate dust grains extracted from meteorites to investigate the relationship between metallic and non-metallic constituents of the grains, and they will perform quantum chemical calculations of dust destruction by ultraviolet radiation and shocks characteristic of planetary nebulae.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.

恒星在演化后期的质量损失是星际介质富含气体、尘埃和重元素的主要途径。该研究项目将研究演化的恒星和行星状星云喷射出的物质的性质。这项研究的结果将使天文学家了解演化后期恒星的物理和化学特性如何影响星际介质中物质的生命周期。该项目将为研究生和本科生（包括来自科学领域代表性不足的群体的学生）提供射电天文学和实验室天体物理研究的先进技术培训。研究小组将开展天文观测、实验室实验和化学建模的综合项目，以探索气相和尘埃颗粒中恒星喷射物的性质，及其对弥漫星际介质的影响。他们将使用地面单孔径干涉射电望远镜对星周包层和行星状星云进行分子谱线观测。为了补充和指导观测，他们将测量含金属分子的实验室旋转光谱，这些分子被认为在演化恒星的富碳和富氧包层中很重要。他们将对从陨石中提取的碳和硅酸盐尘埃颗粒进行透射电子显微成像，以研究颗粒的金属和非金属成分之间的关系，并对紫外线辐射和行星状星云的冲击特征造成的尘埃破坏进行量子化学计算。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力评估进行评估，认为值得支持。优点和更广泛的影响审查标准。