双星的演化及其对演化星族合成的启示
Evolution of binary stars and its implications for evolutionary population synthesis
摘要：
大多数恒星都是双星系统的成员，而在近距离双星系统中的恒星的演化与在近距离双星系统中的恒星的演化不同，因为它的伴星很接近。双星系统中的成分以多种方式相互作用，双星演化导致许多特殊恒星的形成，包括蓝离散星和热亚矮星。我们将讨论双星的演化和蓝离散星和热次矮星的形成，并指出这些热天体在演化布居合成（EPS）研究中的重要性，并得出结论，双星相互作用应包括在EPS的研究。事实上，双星相互作用使恒星星族更年轻（更热），椭圆星系中的远紫外线（UV）过剩很可能是由双星相互作用造成的。这对于理解远紫外线过剩和椭圆星系的演化具有重要意义。特别是，它意味着远紫外线过剩不是年龄的标志，因为已经假设principal和预测，它不应该强烈依赖于人口的金属丰度，但普遍存在从矮椭圆星系到巨型椭圆星系。
英文摘要：
Most stars are members of binaries, and the evolution of a star in a close binary system differs from that of an ioslated star due to the proximity of its companion star. The components in a binary system interact in many ways and binary evolution leads to the formation of many peculiar stars, including blue stragglers and hot subdwarfs. We will discuss binary evolution and the formation of blue stragglers and hot subdwarfs, and show that those hot objects are important in the study of evolutionary population synthesis (EPS), and conclude that binary interactions should be included in the study of EPS. Indeed, binary interactions make a stellar population younger (hotter), and the far-ultraviolet (UV) excess in elliptical galaxies is shown to be most likely resulted from binary interactions. This has major implications for understanding the evolution of the far-UV excess and elliptical galaxies in general. In particular, it implies that the far-UV excess is not a sign of age, as had been postulated prviously and predicts that it should not be strongly dependent on the metallicity of the population, but exists universally from dwarf ellipticals to giant ellipticals.
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