sgr / axp是否起源于中子星双星?

J.Wang, H.-K. Chang
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引用次数: 1

摘要

软伽玛中继器(sgr)和异常x射线脉冲星(axp)是近几十年来被广泛研究的两类神秘天体。基于对sgr / axp的时间行为、光谱和变异性的大量信息,我们提出sgr / axp是具有极强磁场的孤立中子星(NSs),即磁星。尽管如此,一些替代的模型可能同样令人信服,比如那些提出它们是带退盘的吸积NSs或旋转驱动的磁化大质量白矮星。sgr / axp的性质和培养仍然存在争议。在本文中,我们提出sgr / axp可以起源于双星系统中的正常nsss,这是由于索恩-Żytkow天体(TZO)中大质量恒星包层的瞬间收缩引起的正常nsss的再爆炸。自旋周期聚集是由于缓慢旋转包络的制动或在共包络阶段的摩擦阻力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Can SGRs/AXPs Originate from Neutron Star Binaries?
Soft gamma repeaters (SGRs) and anomalous X-ray pulsars (AXPs) are two groups of enigmatic objects, which have been extensively investigated in past few decades. Based on the ample information about their timing behaviors, spectra, and variability properties, it was proposed that SGRs/AXPs are isolated neutron stars (NSs) with extremely strong magnetic fields, the so-called magnetars. Nonetheless, some alternative models are probably equally convincing such as those proposing that they are accreting NSs with a fall-back disk or rotation-powered magnetized and massive white dwarfs. The nature and nurture of SGRs/AXPs remain controversial. In this paper, we propose that SGRs/AXPs can, alternatively, originate from normal NSs in binary systems, which resorts to the reexplosion of normal NS induced by instant contraction of the massive star envelope in a Thorne-Żytkow object (TZO). The spin-period clustering is due to either the brake of a slowly rotating envelope or the frictional drag during the common-envelope phase.
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