Stellar Chemistry

这个项目是一项为期三年的关于天文尘埃形成环境中元素的气体和凝聚化学的理论研究，重点是演化的恒星。这项研究是罗德斯博士之前进行的理论工作的扩展。在这里，洛德斯博士将与合作者和学生一起，为解释恒星环境中气体和凝析油的化学成分提供一个基本框架。这项工作对天体物理和宇宙化学的几个领域很重要，因为一旦物理条件允许气体分子和凝析油形成，化学就会接管。分子气体和尘埃化学很重要的系统包括原恒星盘(有行星形成和没有行星形成)；以及向星际介质提供尘埃和气体的演化恒星的喷出物，新的恒星和行星系统就是从星际介质中产生的。该项目的重点是非太阳金属的化学，与高金属丰度恒星周围的行星形成以及低金属丰度恒星周围的凝聚，甚至是高红移的尘埃星系中的凝聚密切相关。该项目是对红巨星和其他尘埃恒星分子主导大气和星周壳层的光谱研究的补充。物体。这里将要进行的计算可以作为解释从哈勃空间望远镜(HST)、红外空间天文台(ISO)、斯皮策空间望远镜、红外平流层红外天文学天文台(SOFIA)和赫歇尔空间天文台等仪器获得的观测结果的指南。该项目的关键是与观察员持续合作，开发和测试化学分馏模型。这项工作也是对从陨石中分离出来的太阳系前颗粒(星尘)的分析的补充，具有不同学科专门知识的研究人员正在进行的合作将加强气象学、天体物理学和观测天文学之间的跨学科联系，并加强国际网络。该项目还包括本科生的参与，并将为他们提供宝贵的研究经验，有助于培养下一代天文学家。结果将在科学论文、专业会议和公开讲座中描述。罗德？S博士网站的扩展计划是这一努力的一部分，以使计算结果广泛可用。

This project is a three-year theoretical investigation into the gas and condensation chemistry of the elements in astronomical dust forming environments, with an emphasis on evolved stars. The research is an expansion of theoretical work that Dr. Lodders carried out previously. Here, working with collaborators and students, Dr. Lodders will provide a fundamental framework for interpreting the chemical composition of the gas and condensates in stellar environments. The work is important to several areas in astrophysics and cosmochemistry as chemistry takes over as soon as physical conditions allow gas molecule and condensate formation. Systems where molecular gas and dust chemistry is important include protostellar disks (with and without planetary formation); and ejecta of evolved stars that feed dust and gas to the interstellar medium, from which new stellar and planetary systems originate. The project, which focuses on chemistry at non-solar metallicities is highly relevant to planetary formation around high metallicity stars, as well as condensation around low-metallicity stars or even in dusty galaxies at high red-shift. The project is complementary to spectroscopic studies of the molecular dominated atmospheres and circumstellar shells of red giant stars and other ?dusty? objects. The computations to be carried out here can be used as a guide to interpret observations obtained from instruments such as the Hubble Space Telescope (HST), the Infrared Space Observatory (ISO), the Spitzer Space Telescope, the Stratospheric Observatory for Infrared Astronomy (SOFIA), and the Herschel Space Observatory. Key to the project are ongoing collaborations with observers to develop and test chemical fractionation models. The work is also complementary to the analysis of presolar grains (stardust) isolated from meteoritesThe ongoing collaborations of researchers with expertise in different disciplines will enhance interdisciplinary connections between meteoritics, astrophysics, and observational astronomy as well as strengthening international networks. The project also includes the participation of undergraduate students, and will provide them with valuable research experience, helping to train the next generation of astronomers. Results will be described in scientific papers, at professional meetings, and in public lectures. Expansions of Dr. Lodder?s website are planned as part of this effort to make computational results widely available.