arXiv 1010.22002010-10-11astro-ph.SR

双星是最好的单星

Binaries are the best single stars

S. E. de Mink, N. Langer, R. G. Izzard

备注：: 5 pages, 1 figure, contribution to the proceedings of "The multi-wavelength view of hot, massive stars", 39th Li`ege Int. Astroph. Coll., 12-16 July 2010

摘要：

大质量单恒星的恒星模型仍然受到重大不确定性的困扰。根据观测结果进行测试和校准对于其可靠性至关重要。为此，最好使用从未经历过强双星相互作用的观测恒星，即“真正的单星”。然而，大质量恒星中的双星比例很高，识别“真正的单星”并不简单。双星相互作用影响系统的方式是，最初质量较小的恒星变成或似乎是单一的。例如，质量转移会导致施主星的轨道变宽和光度降低，这使得它很难被探测到。在超新星爆炸合并或破坏系统后，将没有伴星存在。唯一明确的“真正的单星”是可能的分离双星，其中包含两个主序星。对于这些系统，我们可以排除质量传递的发生，因为他们的诞生。另一个优点是，双星通常可以为我们提供基本恒星参数的直接测量。因此，我们认为这些二进制是值得的努力需要观察和分析它们。它们可能为单恒星模型提供最严格的测试案例。

英文摘要：

Stellar models of massive single stars are still plagued by major uncertainties. Testing and calibrating against observations is essential for their reliability. For this purpose one preferably uses observed stars that have never experienced strong binary interaction, i.e. "true single stars". However, the binary fraction among massive stars is high and identifying "true single stars" is not straight forward. Binary interaction affects systems in such a way that the initially less massive star becomes, or appears to be, single. For example, mass transfer results in a widening of the orbit and a decrease of the luminosity of the donor star, which makes it very hard to detect. After a merger or disruption of the system by the supernova explosion, no companion will be present. The only unambiguous identification of "true single stars" is possible in detached binaries, which contain two main-sequence stars. For these systems we can exclude the occurrence of mass transfer since their birth. A further advantage is that binaries can often provide us with direct measurements of the fundamental stellar parameters. Therefore, we argue these binaries are worth the effort needed to observe and analyze them. They may provide the most stringent test cases for single stellar models.

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