在星族综合模型中重访双星
Revisiting binary stars in population synthesis models
摘要：
我们报告的人口合成模型，遵循单星和双星的演变的结果。在这个模型中，我们包括了Han等人（2002）提出的EHB星形成的2HeWD合并通道。由此产生的EHB星的物理参数来自BaSTI数据库，因此是现实的和观测支持。这个模型的预测与传统的星族合成模型吻合得很好，除了当恒星星族的光谱由双星或其产物主导时，例如，EHB星在ETG的UV中。我们成功地再现了富金属疏散星团NGC 6791的CMD和SED。该星团中的恒星星族可能是显示UVX现象的ETG中恒星星族的原型。我们的模型应该是适当的研究紫外线在ETG的上升。
英文摘要：
We report results of a population synthesis model that follows the evolution of single and binary stars. In this model we include the 2HeWD merger channel, suggested by Han et al. (2002), for the formation of EHB stars. The physical parameters of the resulting EHB stars are derived from the BaSTI database, and are thus realistic and observationally supported. The predictions of this model are in good agreement with traditional population synthesis models, except when the spectrum of the stellar population is dominated by binary stars or their products, e.g., EHB stars in the UV of ETGs. We reproduce successfully the observed CMD and SED of the metal rich open cluster NGC 6791. The stellar population in this cluster may be archetypal of the stellar population in ETGs that show the UVX phenomenon. Our models should be appropriate to study the UV upturn in ETGs.
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