arXiv 1101.28642011-01-14astro-ph.SRastro-ph.HE

致密恒星系统中双星的演化

Evolution of Binaries in Dense Stellar Systems

Natalia Ivanova

备注：: 8 pages, 2 figures. To appear in the proceedings of the conference "Binary Star Evolution: Mass Loss, Accretion and Mergers" (ed. V. Kalogera and M. van der Sluys, AIP Conf. Ser.), held in Mykonos, Greece, held in June 22-25, 2010
DOI：: 10.1063/1.3536357

摘要：

与磁场相反，稠密恒星系统中的双星通常不是原始的，它们可以是动态形成的，也可以是从原始状态发生显著变化的。双星的毁灭和形成总是同时发生的。这种破坏，不断地从二进制池中删除软二进制，作为一种能量汇，可能是集群进入二进制燃烧阶段的原因。真实的二进制分数大于观察到的，因此，可观察到的二进制分数的演变与预测不同。对球状星团中双星分数的综合测量表明，大多数星团仍处于核心收缩状态。另一方面，X射线的形成会影响到大多数进化程度更高的恒星，这会显著增加球状星团中X射线源的数量。双星与致密天体的形成主要是通过物理碰撞、双星与双星和单双星相遇;然而，三重双星和多重相遇的动力学形成主要决定了所形成的双星是否会成为X射线源。

英文摘要：

In contrast to the field, the binaries in dense stellar systems are frequently not primordial, and could be either dynamically formed or significantly altered from their primordial states. Destruction and formation of binaries occur in parallel all the time. The destruction, which constantly removes soft binaries from a binary pool, works as an energy sink and could be a reason for cluster entering the binary-burning phase. The true binary fraction is greater than observed, as a result, the observable binary fraction evolves differently from the predictions. Combined measurements of binary fractions in globular clusters suggest that most of the clusters are still core-contracting. The formation, on other hand, affects most the more evolutionary advanced stars, which significantly enhances the population of X-ray sources in globular clusters. The formation of binaries with a compact objects proceeds mainly through physical collisions, binary-binary and single-binary encounters; however, it is the dynamical formation of triples and multiple encounters that principally determine whether the formed binary will become an X-ray source.

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