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arXiv 1004.4957astro-ph.SR
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关于公共包络演化的Binding Energy参数$λ$

On the Binding Energy Parameter $λ$ of Common Envelope Evolution

Xiao-Jie Xu, Xiang-Dong Li

摘要:

结合能参数$λ$在共包络(CE)演化中起着重要的作用。尽管在大多数星族合成计算中,$λ$被作为常数采用,但前人的工作已经指出,它在整个恒星演化中是变化的。我们系统地计算了质量为$1-20 M_{\sun}$的第一星族和第二星族恒星的结合能参数$λ$,并考虑了恒星物质的内能的贡献。我们提出的拟合公式$λ$,可以纳入未来的人口合成调查。我们还简要地讨论了结果在二元演化中的可能应用。

英文摘要:

The binding energy parameter $λ$ plays an important role in common envelope (CE) evolution. Previous works have already pointed out that $λ$ varies throughout the stellar evolution, though it has been adopted as a constant in most of the population synthesis calculations. We have systematically calculated the binding energy parameter $λ$ for both Population I and Population II stars of masses $1-20 M_{\sun}$, taking into account the contribution from the internal energy of stellar matter. We present fitting formulae for $λ$ that can be incorporated into future population synthesis investigations. We also briefly discuss the possible applications of the results in binary evolutions.

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