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首页> 外文期刊>The Astrophysical journal >FORMATION OF BINARY MILLISECOND PULSARS BY ACCRETION-INDUCED COLLAPSE OF WHITE DWARFS UNDER WIND-DRIVEN EVOLUTION
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FORMATION OF BINARY MILLISECOND PULSARS BY ACCRETION-INDUCED COLLAPSE OF WHITE DWARFS UNDER WIND-DRIVEN EVOLUTION

机译:风推动下白矮星的积聚诱导塌陷形成二元微距脉

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Accretion-induced collapse (AIC) of massive white dwarfs (WDs) has been proposed to be an important channel to form binary millisecond pulsars (MSPs). Recent investigations on thermal timescale mass transfer in WD binaries demonstrate that the resultant MSPs are likely to have relatively wide orbit periods ( 10 days). Here we calculate the evolution of WD binaries taking into account the excited wind from the companion star induced by X-ray irradiation of the accreting WD, which may drive rapid mass transfer even when the companion star is less massive than the WD. This scenario can naturally explain the formation of the strong-field neutron star in the low-mass X-ray binary 4U 1822–37. After AIC the mass transfer resumes when the companion star refills its Roche lobe, and the neutron star is recycled owing to mass accretion. A large fraction of the binaries will evolve to become binary MSPs with an He WD companion, with the orbital periods distributed between 0.1 days and 30 days, while some of them may follow the cataclysmic variable-like evolution toward very short orbits. If we instead assume that the newborn neutron star appears as an MSP and that part of its rotational energy is used to ablate its companion star, the binaries may also evolve to be the redback-like systems.
机译:大量的白矮星(WD)的增生诱发的崩塌(AIC)已被提议为形成二进制毫秒脉冲星(MSP)的重要渠道。最近对WD双星热时标质量转移的研究表明,合成的MSP可能具有相对较宽的轨道周期(10天)。在这里,我们考虑到由积聚的WD的X射线辐射引起的来自伴星的激发风,计算了WD双星的演化,即使当伴星的质量不如WD时,这也可能推动快速的质量转移。这种情况自然可以解释低质量X射线双星4U 1822–37中强场中子星的形成。在AIC之后,当伴星补充其罗氏波瓣时,质量转移恢复,而中子星由于吸积而被回收。很大一部分的双星将演变成带有He WD伴星的双星MSP,其轨道周期分布在0.1天到30天之间,而其中一些可能遵循类似于大地变迁的演化向非常短的轨道发展。相反,如果我们假设新生中子星是作为MSP出现的,并且其部分旋转能被用来烧蚀其伴星,那么双星也可能演变成类似红背的系统。

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