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arXiv 1310.6535astro-ph.HE
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共同包络机制:来自高质量X射线双星X射线光度函数的约束

Common Envelope Mechanisms: Constraints from the X-ray Luminosity Function of High Mass X-ray Binaries

Zhao-Yu Zuo, Xiang-Dong Li

摘要:

利用近星系中高质量X射线双星(HMXB)的X射线光度函数(XLF),对控制双星演化的共同包络机制(CE)进行了约束.我们发现,XLF可以在通常采用的CE机制下非常接近地再现,即,的$α_{\rm CE}$形式主义和$γ$算法,与一个合理的范围内考虑的参数。假设参数组合相同,则$γ$算法可能产生比$α_{\rm CE}$形式体系多的HMXB,多到$\sim$ 10倍。在$α_{\rm CE}$形式主义的框架中,需要高值的$α_{\rm CE}$来拟合观察到的XLF,尽管它不会显著影响HMXB群体的全局数量。我们在$γ$算法下给出了HMXB群体的详细组成部分,并将其与Zuo等人和观察结果进行了比较。我们认为,不同的观测特性,以及HMXB的周期分布,可以提供进一步的线索,区分这两种类型的CE机制。

英文摘要:

We use the measured X-ray luminosity function (XLF) of high-mass X-ray binaries (HMXBs) in nearby star-forming galaxies to constrain the common envelope (CE) mechanisms, which play a key role in governing the binary evolution. We find that the XLF can be reproduced quite closely under both CE mechanisms usually adopted, i.e., the $α_{\rm CE}$ formalism and the $γ$ algorithm, with a reasonable range of parameters considered. Provided that the parameter combination is the same, the $γ$ algorithm is likely to produce more HMXBs than the $α_{\rm CE}$ formalism, by a factor of up to $\sim$ 10. In the framework of the $α_{\rm CE}$ formalism, a high value of $α_{\rm CE}$ is required to fit the observed XLF, though it does not significantly affect the global number of the HMXB populations. We present the detailed components of the HMXB populations under the $γ$ algorithm and compare them with those in Zuo et al. and observations. We suggest the distinct observational properties, as well as period distributions of HMXBs, may provide further clues to discriminate between these two types of CE mechanisms.

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