星系中的星云丰度：小心偏见
Nebular abundances in galaxies: Beware of biases
摘要：
用强线法计算星系中星云丰度是一种简便、快速的方法。为此目的设计和校准了各种指数，并广泛使用。但是，如果所研究的物体的结构特性（电离辐射场的硬度、星云的形态）与用于校准这些方法的结构特性不同，则用这些方法得出的丰度可能会有很大的偏差。在比较不同样品的金属丰度时需要特别小心，例如蓝色致密星系和其他发射线矮星系，或不同红移的样品。
英文摘要：
The derivation of nebular abundances in galaxies using strong line methods is simple and quick. Various indices have been designed and calibrated for this purpose, and they are widely used. However, abundances derived with such methods may be significantly biased, if the objects under study have different structural properties (hardness of the ionizing radiation field, morphology of the nebulae) than those used to calibrate the methods. Special caution is required when comparing the metallicities of different samples, like, for example, blue compact galaxies and other emission line dwarf galaxies, or samples at different redshifts.
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