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arXiv 1106.4741astro-ph.SR
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普通包层弹射效率是二元参数的函数吗?

Is the common envelope ejection efficiency a function of the binary parameters?

P. J. Davis, U. Kolb, C. Knigge

摘要:

我们重建了当前观测到的白矮星-主序星后共包络双星(PCEBs)的共包络(CE)相位。我们应用多元回归分析,以调查是否存在相关性之间的CE喷射效率,α_CE,推断从样品,和二进制参数:白矮星质量,二次质量,轨道周期在点CE开始,或轨道周期后立即CE阶段。我们这样做的时候,有没有考虑到原始巨星包层的内能。我们的配合应该铺平了第一步的观测动机的配方计算alpha_CE使用的二进制参数在CE阶段的开始,这将是有用的人口合成计算或模型的紧凑的二进制进化。如果我们确实考虑到巨星包层的内能,我们会发现α CE和白矮星质量之间存在统计上显著的相关性。如果我们不这样做,则在CE阶段开始的点处,在alpha_CE和轨道周期之间发现相关性。此外,如果考虑到原始包层的内能,则CE喷射效率在规范范围0<α_CE<=1内,尽管具有棕矮星次级包层的PCEB仍然需要α_CE>=1。

英文摘要:

We reconstruct the common envelope (CE) phase for the current sample of observed white dwarf-main sequence post-common envelope binaries (PCEBs). We apply multi-regression analysis in order to investigate whether correlations exist between the CE ejection efficiencies, alpha_CE, inferred from the sample, and the binary parameters: white dwarf mass, secondary mass, orbital period at the point the CE commences, or the orbital period immediately after the CE phase. We do this with and without consideration for the internal energy of the progenitor primary giants' envelope. Our fits should pave the first steps towards an observationally motivated recipe for calculating alpha_CE using the binary parameters at the start of the CE phase, which will be useful for population synthesis calculations or models of compact binary evolution. If we do consider the internal energy of the giants' envelope, we find a statistically significant correlation between alpha_CE and the white dwarf mass. If we do not, a correlation is found between alpha_CE and the orbital period at the point the CE phase commences. Furthermore, if the internal energy of the progenitor primary envelope is taken into account, then the CE ejection efficiencies are within the canonical range 0<alpha_CE<=1, although PCEBs with brown dwarf secondaries still require alpha_CE>=1.

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