行星状星云和麦哲伦星云的化学演化
Planetary nebulae and the chemical evolution of the Magellanic Clouds
摘要：
不同星系行星状星云（PN）化学丰度的精确测定，使我们能够获得这些系统的化学演化模型的重要约束。我们有一个长期的计划，以获得本星系群的星系，特别是大麦哲伦云和小麦哲伦云的丰度。在这项工作中，我们提出了我们对这些对象的新结果，并讨论了它们的影响，鉴于最近的丰度测定的文献。特别是，我们获得的距离无关的相关性，涉及He，N，O，Ne，S和Ar，并比较结果与我们自己的银河系和其他星系的本星系群的数据。由于我们的观测计划，我们有一个大的数据库PN在银河系和麦哲伦云，使我们能够获得可靠的约束核合成过程中的祖星在不同的金属丰度的星系。
英文摘要：
The determination of accurate chemical abundances of planetary nebulae (PN) in different galaxies allows us to obtain important constraints of chemical evolution models for these systems. We have a long term program to derive abundances in the galaxies of the Local Group, particularly the Large and Small Magellanic Clouds. In this work, we present our new results on these objects and discuss their implications in view of recent abundance determinations the literature. In particular, we obtain distance-independent correlations involving He, N, O, Ne, S, and Ar, and compare the results with data from our own Galaxy and other galaxies in the Local Group. As a result of our observational program, we have a large database of PN in the Galaxy and the Magellanic Clouds, so that we can obtain reliable constraints to the nucleosynthesis processes in the progenitor stars in galaxies of different metallicities.
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