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
• 负责人: Lucy Ziurys
• 金额: $ 20万
• 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: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0906534&HistoricalAwards=false
• 关键词: Following; Refractory; Elements; Circumstellar; Ejecta

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Under this award Drs. Lucy Ziurys and DeWayne Halfen (University of Arizona) will continue their investigation of the chemistry of the refractory elements through the ongoing joint laboratory/observational program. The laboratory investigations will focus on new metal oxide, carbide, nitride, and cyanide species such as KO, AlO+, HMgNC, and MgC. The Ziurys group has already recorded spectra of numerous oxides, carbides, and cyanide species, and this new work will be an extension of well-understood techniques. In addition, the laboratory studies will be expanded to include possible new phosphorus-bearing species. A new phosphorus source has been developed in the Ziurys group for this purpose, which has already been successfully employed. Molecules of interest include C3P, PCO, PNH+, NiP, and FeP. The latter two species are likely precursors to schreibersite, [Fe,Ni]3P, the proposed solid-state carrier of circumstellar phosphorus. The proposed observations will entail searching for these possible new species in circumstellar and, in certain cases (i.e., for PNH+), interstellar gas via their pure rotational spectra. Measurements of both ions and neutrals are essential in identifying the major carriers of the refractory elements in dense material, and will aid in establishing chemical formation mechanisms. These studies will also help draw the connection between gas-phase molecules and dust grains, and allow for a more quantitative evaluation of elemental depletions. The target source list will include asymptotic giant branch and supergiant envelopes (both oxygen- and carbon-rich), planetary nebulae, and select molecular clouds.This research is highly interdisciplinary and will involve the interplay of observational and experimental methods. The bulk of the research will be carried out by graduate and undergraduate students, the majority of which are female, who will receive a very unique education with diverse skills, enabling them to better contribute as scientists to society. Dr. Ziurys is actively involved in the development of interdisciplinary courses and a website for basic molecular spectroscopy. The development of highly sensitive gas-phase laboratory spectrometers is also relevant to defense and homeland security, particularly in the terahertz frequency regime.

该奖项是根据2009年《美国复苏与再投资法》（公法111-5）资助的。根据该奖项。露西·齐鲁斯（Lucy Ziurys）和德韦恩（Dewayne Halfen）（亚利桑那大学）将通过正在进行的联合实验室/观察计划继续调查难治元素的化学。实验室研究将集中于新的金属氧化物，碳化物，氮化物和氰化物物种，例如KO，ALO+，HMGNC和MGC。 Ziurys组已经记录了许多氧化物，碳化物和氰化物物种的光谱，这项新作品将是众所周知的技术的扩展。此外，将扩展实验室研究，包括可能的新含磷物种。为此，Ziurys组已开发了一种新的磷来源，该目的已经成功地使用了。 感兴趣的分子包括C3P，PCO，PNH+，NIP和FEP。后两个物种可能是Schreibersite的前体，[Fe，ni] 3p是拟议的属性磷的固态载体。 所提出的观察结果将需要在情节中搜索这些可能的新物种，在某些情况下（即PNH+）通过其纯旋转光谱（即PNH+），是星际气体。离子和中性的测量对于确定致密材料中难治元的主要载体至关重要，并将有助于建立化​​学形成机制。这些研究还将有助于吸引气相分子与尘埃之间的联系，并允许对元素消耗进行更定量的评估。目标源列表将包括渐近巨型分支和超级信封（氧气和富含碳富含碳），行星星云和精选分子云。这项研究是高度跨学科的，将涉及观察和实验方法的相互作用。大部分研究将由研究生和本科生进行，其中大多数是女性，她们将接受具有多种技能的非常独特的教育，使他们能够更好地为社会做出科学家的贡献。 Ziurys博士积极参与跨学科课程的发展和基本分子光谱的网站。高度敏感的气相实验室光谱仪的发展也与国防和国土安全性有关，尤其是在Terahertz频率制度中。