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Numerical simulations of thermonuclear flashes on neutron stars

机译:中子星上热核闪光的数值模拟

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摘要

Helium accreting slowly onto the surface of a neutron star accumulates in a thin surface layer. After reaching a depth of approximately 100 m and a density of about 2 x 10(8) gm cm(-3), the helium layer becomes unstable and a thermonuclear runaway initiates at its base. Since the runaway time scale is much shorter than the accretion time scale, it is likely that ignition will occur at a single point instead of simultaneously over the entire surface. This conclusion is supported by observations of brightness oscillations in X-ray bursts. In this case, a burning front will propagate across the surface, eventually consuming the entire layer. This paper describes high-resolution two-dimensional simulations of the propagation of a helium detonation across the surface of a neutron star. [References: 12]
机译:缓慢吸收到中子星表面上的氦气堆积在薄的表层中。到达约100 m的深度和约2 x 10(8)gm cm(-3)的密度后,氦气层变得不稳定,并且在其底部开始出现热核逸散。由于失控时间尺度比积聚时间尺度短得多,因此点火很可能在单个点发生,而不是在整个表面上同时发生。该结论得到X射线猝发亮度振荡观察的支持。在这种情况下,燃烧的前沿将在整个表面上传播,最终消耗整个层。本文描述了氦爆轰在中子星表面传播的高分辨率二维模拟。 [参考:12]

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