Metal-Containing Molecules as Probes of Interstellar/Circumstellar Gas: From Chemistry to Nucleosynthesis

含金属分子作为星际/星际气体探针：从化学到核合成

基本信息

批准号：
0204913
负责人：
Lucy Ziurys
金额：
$ 26.25万
依托单位：
University of Arizona
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2002
资助国家：
美国
起止时间：
2002-07-15 至 2005-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0204913&HistoricalAwards=false
关键词：
Metal Containing Molecules Probes Interstellar

项目摘要

AST-0204913PI ZiurysDuring the past thirty years since the initial discovery of interstellar molecules at radio wavelengths, much has been learned about the chemistry of such species, and their subsequent use as tracers of the physical conditions in dense gas has proved extremely valuable. Despite the obvious success of molecular astrophysics, there are still many unanswered questions pertaining to interstellar molecules, one of which concerns the chemistry and abundances of species containing the metallic elements. This project will continue the investigation of the chemistry of the metallic elements in the interstellar medium through a joint laboratory/observational/chemical modeling program. The observations will identify the major molecular carriers of the metallic elements incircumstellar envelopes of evolved stars and in dense clouds through measurements in the millimeter/sub-mm wavelength region. This data will lead to the establishment of likely synthetic pathways, be it gas-phase radiative association reactions, dust-grain processes or formation in shock waves. The laboratory work will supply the necessary millimeter and sub-mm rotational spectra from which rest frequencies for the astronomical searches are obtained. Finally, chemical modeling of metal chemistry in circumstellar envelopes will be performed in conjunction with new nucleosynthesis calculations. A complete picture will thus be constructed of metal-containing molecules, their abundances, formation mechanisms, and significance for understanding mass loss of the heavier elements from circumstellar envelopes to the interstellar medium.***

自从无线电波长处最初发现星际分子以来，过去三十年来，AST-0204913PI Ziurysdsd，已经了解了这种物种的化学反应，随后用作浓稠气体中物理条件的示踪剂的使用已被证明非常有价值。尽管分子天体物理学取得了明显的成功，但仍然存在许多与星际分子有关的未解决问题，其中之一涉及含有金属元素的化学和丰度。该项目将通过联合实验室/观察/化学建模计划继续研究星际培养基中金属元素的化学。这些观察结果将通过毫米/亚MM波长区域中的测量值确定金属元件的主要分子载体和不断发展的恒星和致密云中的主要分子载体。这些数据将导致建立可能的合成途径，无论是气相辐射缔合反应，尘土过程还是冲击波中的形成。实验室工作将提供必要的毫米和亚MM旋转光谱，从中获得用于天文搜索的休息频率。最后，将与新的核合成计算结合进行，将金属化学的化学建模与新的核合成计算一起进行。因此，完整的图像将由含金属的分子，它们的丰度，形成机制以及了解从偶然信封到星际介质的较重元素的质量损失的重要性。***