银河系大质量恒星形成区的同位素分馏研究

L. Colzi
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引用次数: 1

摘要

研究银河系和太阳系化学史最重要的工具之一是测量化学元素的同位素分馏。本研究提出了新的天文观测结果,致力于研究分子中氢和氮的分馏(D/H和14N/15N比),朝向不同演化阶段的大质量恒星形成区。此外,还对碳分馏进行了新的详细理论研究,即12C/13C比值。其中一个主要结果是证实了14N/15N比率随着星系中心距离的增加而增加,这与恒星核合成星系化学演化模型的预测一致。这项工作为理解局部化学过程提供了新的重要输入,这些过程有利于在恒星形成区域产生具有不同同位素的分子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isotopic fractionation study towards massive star-forming regions across the Galaxy
One of the most important tools to investigate the chemical history of our Galaxy and our own Solar System is to measure the isotopic fractionation of chemical elements. In the present study new astronomical observations devoted to the study of hydrogen and nitrogen fractionation (D/H and 14N/15N ratios) of molecules, towards massive star-forming regions in different evolutionary phases, have been presented. Moreover, a new detailed theoretical study of carbon fractionation, 12C/13C ratios, has been done. One of the main results was the confirmation that the 14N/15N ratio increases with the galactocentric distance, as predicted by stellar nucleosynthesis Galactic chemical evolution models. This work gives new important inputs on the understanding of local chemical processes that favor the production of molecules with different isotopes in star-forming regions.
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