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arXiv 1908.02776astro-ph.HEastro-ph.SR
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低偏心率Be/X射线双星的I型爆发

Type I outbursts in low eccentricity Be/X-ray binaries

Alessia Franchini, Rebecca G. Martin

摘要:

Be/X射线双星的I型爆发通常与双星轨道的偏心率有关。中子星在每一次近星点通过时都从Be星周围的衰变盘外部吸积气体。然而,这种机制不能解释I型爆发,已观察到近圆形轨道的Be/X射线双星。流体动力学模拟和分析估计,我们发现,在一个圆形轨道的二进制,一个几乎共面的磁盘周围的Be星可以成为偏心。双星的极端质量比导致Be星盘内部存在3:1的Lindblad共振,这驱动了偏心率的增长。因此,中子星每次接近盘状的近星时都能捕获物质,时间尺度比轨道周期长百分之几。我们已经发现了一个新的应用,这是能够解释所观察到的低偏心率Be/X射线双星的I型爆发的机制。

英文摘要:

Type I outbursts in Be/X-ray binaries are usually associated with the eccentricity of the binary orbit. The neutron star accretes gas from the outer parts of the decretion disk around the Be star at each periastron passage. However, this mechanism cannot explain type I outbursts that have been observed in nearly circular orbit Be/X-ray binaries. With hydrodynamical simulations and analytic estimates we find that in a circular orbit binary, a nearly coplanar disk around the Be star can become eccentric. The extreme mass ratio of the binary leads to the presence of the 3:1 Lindblad resonance inside the Be star disk and this drives eccentricity growth. Therefore the neutron star can capture material each time it approaches the disk apastron, on a timescale up to a few percent longer than the orbital period. We have found a new application of this mechanism that is able to explain the observed type I outbursts in low eccentricity Be/X-ray binaries.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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