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THE BURSTING BEHAVIOR OF 4U 1728-34: THE PARAMETERS OF A NEUTRON STAR AND THE GEOMETRY OF A NEUTRON STAR-DISK SYSTEM

机译:4U 1728-34的爆发行为:中子星的参数和中子星盘系统的几何

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摘要

We analyze a set of type Ⅰ X-ray bursts from the low-mass X-ray binary 4U 1728-34, observed with the Rossi X-Ray Timing Explorer. We infer the dependence of the neutron star (NS) mass and radius with respect to the assumed distance to the system using an analytical model of X-ray burst spectral formation. The model behavior clearly indicates that the burster atmosphere is dominated by helium. Our results strongly favor the soft equation of state of the NS for 4U 1728-34. We find that the distance to the source should be within the 4.5-5.0 kpc range. We obtain rather narrow constrains for the NS radius in the 8.7-9.7 km range and in the 1.2-1.6 solar mass interval for the NS mass for this particular distance range. We uncover a temporal behavior of redshift-corrected burst flux for the radial expansion episodes, and we put forth a dynamical evolution scenario for the NS-accretion disk geometry during which an expanded envelope affects the accretion disk and increases the area of the NS exposed to the Earth observer. In the framework of this scenario, we provide a new method for the estimation of the inclination angle that leads to the value of ~50° for 4U 1728-34.
机译:我们分析了低质量X射线二进制4U 1728-34产生的一组Ⅰ型X射线爆发,并用Rossi X射线定时探测器进行了观测。我们使用X射线猝发谱形成的解析模型来推断中子星(NS)的质量和半径相对于到系统的假定距离的依赖性。该模型的行为清楚地表明,爆破气氛主要由氦气控制。我们的结果强烈支持4U 1728-34的NS软状态方程。我们发现到源的距离应在4.5-5.0 kpc范围内。对于这个特定的距离范围,我们获得了在8.7-9.7 km范围内的NS半径和在1.2-1.6太阳质量区间内的NS质量相当狭窄的约束。我们揭示了径向扩展事件经红移校正的突发通量的时间行为,并提出了NS吸积盘几何形状的动态演化方案,在此过程中,扩展包络影响吸积盘并增加了暴露于NS的NS面积。地球观察者。在这种情况下,我们提供了一种估计倾角的新方法,该方法导致4U 1728-34的值约为50°。

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