Laboratory Measurements of Electrostatic and Magnetostatic Properties of Stellar and Circumstellar Molecules

恒星和星周分子静电和静磁特性的实验室测量

• 批准号: 1715049
• 负责人: Timothy Steimle
• 金额: $ 33.91万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2020-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1715049&HistoricalAwards=false
• 关键词: Laboratory; Measurements; Electrostatic; Magnetostatic; Properties

Molecular spectra---the unique energy signatures of molecules---carry important information about the physical conditions of the astronomical environments in which the molecules are found. The main goal of this research project is to perform accurate laboratory measurements of key properties of molecules that are found in star spots and in the gas and dust around old stars. Accurate values of these properties will allow astronomers to extract reliable information from molecular spectra observed in these distant regions and infer the conditions present there. The project will train students and a postdoctoral researcher in advanced experimental techniques. It will also provide an advanced physical science experience to high school students and teachers at a college preparatory academy and science enrichment to local K-12 students.Using state-of-the-art spectroscopic techniques, the research team will accurately measure the electrostatic and magnetostatic properties of refractory diatomic and triatomic molecules that are known constituents of stellar atmospheres and circumstellar envelopes. The measurements will yield (1) dipole moments of AlO, AlNC, FeNC, SiCN, SiH2, SiN, SiC, HNSi, and SiCSi from optical Stark spectra; (2) magnetic g-factors of VO, CrH, FeO, TiH, and TiO from optical Zeeman measurements under magnetic fields comparable to those in star spots; and (3) electronic transition moments and spontaneous emission rates of VO, AlO, FeO, TiH, CrH, and FeH. The high quality laboratory data will allow optimum exploitation of astronomical spectra obtained with large radio and optical telescopes. Key astronomical applications include the elimination of false positives in exoplanet searches in the near-IR by accurate characterization of spectral line broadening in star spots, and the accurate determination of molecular column densities from radio observations of circumstellar envelopes. This project will train undergraduate and graduate students and a postdoctoral fellow in advanced laboratory astrophysics techniques. Additionally, the research team will conduct activities to engage students and teachers at the Arizona State University (ASU) Preparatory Academy in the physical sciences, and it will participate in ASU's "Science Is Fun" program to provide science enrichment to K-12 students, many of whom come from backgrounds underrepresented in science.

分子光谱---分子的独特能量特征 - - 携带有关发现分子的天文环境的物理条件的重要信息。 该研究项目的主要目的是对恒星斑点以及旧恒星周围的气体和尘埃中的分子的关键特性进行准确的实验室测量。 这些特性的准确值将使天文学家可以从在这些遥远区域观察到的分子光谱中提取可靠的信息，并推断出那里的条件。 该项目将培训学生和高级实验技术的博士后研究员。 It will also provide an advanced physical science experience to high school students and teachers at a college preparatory academy and science enrichment to local K-12 students.Using state-of-the-art spectroscopic techniques, the research team will accurately measure the electrostatic and magnetostatic properties of refractory diatomic and triatomic molecules that are known constituents of stellar atmospheres and circumstellar envelopes. 测量结果将产生（1）Alo，Alnc，Fen​​c，SICN，SIH2，SIH2，SIH，SIH，SIC，HNSI和SICSI的偶极矩，来自光学Stark Spectra。 （2）VO，CRH，FEO，TIH和TIO的磁性G因子在磁场下与恒星斑点相当的磁场下的测量。 （3）VO，ALO，FEO，TIH，CRH和FEH的电子过渡矩和自发发射速率。 高质量的实验室数据将允许对大型无线电和光学望远镜获得的天文光谱的最佳开发。 关键的天文应用包括通过准确表征恒星斑点中的光谱线扩展来消除近红外搜索中的假积极因素，以及从无线电观察结果中准确确定分子柱密度的准确测定。 该项目将培训本科生和研究生，以及高级实验室天体物理学技术的博士后研究员。 此外，研究团队将在体育科学的亚利桑那州立大学（ASU）预科学院的学生和老师进行活动中进行活动，它将参加ASU的“科学是有趣”的计划，以向K-12学生提供科学丰富的学生，其中许多人来自科学领域不足的背景。

项目成果

The Stark Effect, Zeeman Effect, and Transition Dipole Moments for the B 2 Σ + − X 2 Σ + Band of Aluminum Monoxide, AlO

一氧化铝 (Al2O) B 2 Σ – X 2 Σ 带的斯塔克效应、塞曼效应和跃迁偶极矩

• DOI: 10.3847/1538-4357/ab6327
• 发表时间: 2020
• 期刊: The Astrophysical Journal
• 作者: Bai, Xilin;Steimle, Timothy C.
• 通讯作者: Steimle, Timothy C.