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arXiv 0710.0189astro-ph
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低质量X射线双星与(毫秒)脉冲星之间的联系:双星演化的观点

The Connection Between Low-Mass X-ray Binaries and (Millisecond) Pulsars: A Binary Evolution Perspective

Christopher J. Deloye

摘要:

本文从双星演化的角度,综述了低质量X射线双星(LMXBs)与双星伴星(bPSR)之间的演化联系。我专注于恒星双星的演化与最终状态组成的脉冲星与低质量(<1.0太阳质量)的同伴,开始在点的同伴的祖先首先启动质量转移到中子星。这种质量转移是否稳定,以及驱动正在进行的质量转移的物理学将伴星的初始质量和初始轨道周期的相空间划分为五个区域。质量转移过程的性质和二进制的最终状态在每个区域的系统之间是不同的;其中四个区域各自产生一种特定的LMXB。我比较的理论预期的人口银河场LMXB与同伴质量的限制和领域的bPSR。我表明,人口的吸积毫秒星都确定只有两个四个LMXB类,这些系统没有容易识别的后代在bPSR人口。我将讨论哪些bPSR亚群可以用二元进化理论来解释,而那些亚群目前还不能解释。最后讨论了这一领域的一些悬而未决的问题。

英文摘要:

I review the evolutionary connection between low-mass X-ray binaries (LMXBs) and pulsars with binary companions (bPSRs) from a stellar binary evolution perspective. I focus on the evolution of stellar binaries with end-states consisting of a pulsar with a low-mass (<1.0 solar mass) companion, starting at the point the companion's progenitor first initiates mass transfer onto the neutron star. Whether this mass transfer is stable and the physics driving ongoing mass transfer partitions the phase space of the companions's initial mass and initial orbital period into five regions. The qualitative nature of the mass-transfer process and the binary's final end-state differ between systems in each region; four of these regions each produce a particular class of LMXBs. I compare the theoretical expectations to the populations of galactic field LMXBs with companion-mass constraints and field bPSRs. I show that the population of accreting millisecond pulsars are all identified with only two of the four LMXB classes and that these systems do not have readily identifiable progeny in the bPSR population. I discuss which sub-populations of bPSRs can be explained by binary evolution theory and those that currently are not. Finally I discuss some outstanding questions in this field.

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