减少，再利用，再循环：行星状星云作为绿色银河公民
Reduce, Reuse, Recycle: Planetary Nebulae as Green Galactic Citizens
摘要：
我们回顾了PNe中的气相丰度，并描述了它们作为原始祖先金属丰度档案的双重效用，以及恒星演化过程中核合成的加工材料来源，即，C、N和S进程元素。我们描述了PN谱的分析，以获得丰度，并讨论了在每一步中不同的选择所产生的差异。从不同的研究小组的银河系和麦哲伦云的abbestival结果，观测结果进行了比较与理论预测的AGB恒星产量。最后，我们提出了需要更多工作来提高我们确定PNE丰度的能力的领域。
英文摘要：
We review gas-phase abundances in PNe and describe their dual utility as archives of original progenitor metallicity via the alpha elements, as well as sources of processed material from nucleosynthesis during the star's evolution, i.e., C, N, and s-process elements. We describe the analysis of PN spectra to derive abundances and discuss the discrepancies that arise from different choices at each step. Abundance results for the Milky Way and Magellanic Clouds from various groups of investigators are presented; the observational results are compared with theoretical predictions of AGB stellar yields. Finally, we suggest areas where more work is needed to improve our abilities to determine abundances in PNe.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
