亚发光O型恒星-起源与演化链接
Subluminous O Stars - Origin and Evolutionary Links
摘要：
热的次亮星可以大致分为B型和O型。与后者不同的是，许多sdB是在近距离双星中发现的，这表明双星演化起着至关重要的作用。最近的NLTE光谱分析显示，sdB星和sdO星之间的进化联系只对缺氦sdO星是合理的，即它们可能是sdB星的继承者。富氦sdO星的大气性质可以解释为后期热闪以及白矮星合并的情况下，虽然这两个模型不匹配的观测到的富氦sdO星的详细属性。白矮星合并的情况是有利的，因为它自然地解释了在富含氦的sdO恒星之间的近距离双星的稀缺性。一颗超高速sdO恒星运动得如此之快，以至于它不受银河系的束缚，它可能是被银河系中心的超大质量黑洞弹射出来的。
英文摘要：
Hot subluminous stars can be roughly divided into B- and O-types. Unlike the latter many sdBs are found in close binaries, indicating that binary evolution plays a vital role. Recent NLTE spectral analyses revealed that an evolutionary link between sdB stars and sdO stars is plausible only for the helium-deficient sdO stars, i.e. they are the likely successors to sdB stars. The atmospheric properties of helium-enriched sdO stars can be explained by the late hot flasher as well as by the white-dwarf merger scenarios, although both models do not match the observed properties of helium-enriched sdO stars in detail. The white dwarf merger scenario is favoured because it naturally explains the scarcity of close binaries amongst helium-enriched sdO stars. A hyper-velocity sdO star moving so fast that it is unbound to the Galaxy has probably been ejected by the super-massive black hole in the Galactic centre.
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