行星状星云光度函数：谜题的碎片
The Planetary Nebula Luminosity Function: Pieces of the Puzzle
摘要：
对[O III] 5007发射谱线的河外巡天观测，为我们提供了大型均匀行星状星云的绝对谱线强度。这些数据已经被用来解决一系列问题，从测量河外距离尺度到研究恒星星族。我回顾了我们目前对[O III]行星状星云光度函数（PNLF）的理解，并讨论了影响其结构的一些物理过程。我还描述了H-alpha PNLF的特性，乍一看，这个函数看起来与[O III] PNLF相似，但它包含了一组非常不同的对象。最后，我讨论了最近的测量α，在一个恒星星族中发现的PNe的数量，该人口的热光度归一化。我表明，与预期相反，在积极的恒星形成螺旋发现的α值基本上是相同的，在晚型椭圆和透镜状系统测量。我将讨论这个结果如何揭示行星状星云现象的物理学。
英文摘要：
Extragalactic surveys in the emission line of [O III] 5007 have provided us with the absolute line strengths of large, homogeneous sets of planetary nebulae. These data have been used to address a host of problems, from the measurement of the extragalactic distance scale, to the study of stellar populations. I review our current understanding of the [O III] planetary nebula luminosity function (PNLF), and discuss some of the physical processes that effect its structure. I also describe the features of the H-alpha PNLF, a function that, upon first glance, looks similar to the [O III] PNLF, but which includes a very different set of objects. Finally, I discuss recent measurements of alpha, the number of PNe found in a stellar population, normalized to that population's bolometric luminosity. I show that, contrary to expectations, the values of alpha found in actively star-forming spirals is essentially the same as those measured in late-type elliptical and lenticular systems. I discuss how this result sheds light on the physics of the planetary nebula phenomenon.
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