新型中间长爆发源XTE J1701-407
The new intermediate long bursting source XTE J1701-407
摘要：
XTE J1701-407是新发现的X射线瞬变源。在这项工作中，我们调查它的流量变化和研究的中间长和短爆发发现的雨燕在2008年7月17日和27日，分别。到目前为止，XTE J1701-407只记录到一个持续时间约为18分钟的中间长爆发和一个10天后的短爆发。我们分析了Swift和RXTE的公开数据，并将观测到的中间长爆发的性质与理论点火条件和光变曲线进行了比较，以探讨可能的核燃烧过程。中间的长爆发可能表现出光球半径的膨胀，使我们能够推导出源的距离在6.2千秒差距假设纯氦的经验推导爱丁顿光度。用两个指数函数拟合中间长爆发的衰变，其e折叠时间分别为τ_1=40（3）s和τ_2=221（9）s。爆发发生在持续亮度为L_{per} =8.3x10E36 erg/s。对于中间长爆发，NS上每单位面积的质量吸积速率为\dot{m} = 4 × 10 E3 g/cm 2/s，释放的总能量为E_{burst} = 3.5 × 10 E40 erg。对于纯氦燃烧，这对应于点火柱深度为y_{ign} = 1.8 × 10 E9 g/cm 2。我们发现，这种爆发的能量学可以用不同的方式建模，作为（i）纯氦点火，作为纯氦吸积或积累过程中稳定燃烧的氢耗尽的结果，或（ii）作为点火的厚层富氢材料的源与低金属性。然而，模型光变曲线的爆发持续时间的比较表明，氢燃烧在爆发过程中发挥了作用，因此，这个源是一个低吸积率爆发与低金属量的吸积材料。
英文摘要：
XTE J1701-407 is a newly discovered X-ray transient source. In this work we investigate its flux variability and study the intermediate long and short bursts discovered by Swift on July 17, and 27, 2008, respectively. So far, only one intermediate long burst, with a duration of ~18 minutes and ten days later a short burst, have been recorded from XTE J1701-407. We analyzed the public available data from Swift and RXTE, and compared the observed properties of the intermediate long burst with theoretical ignition condition and light curves to investigate the possible nuclear burning processes. The intermediate long burst may have exhibited a photospheric radius expansion, allowing us to derive the source distance at 6.2 kpc assuming the empirically derived Eddington luminosity for pure helium. The intermediate long burst decay was best fit by using two exponential functions with e-folding times of τ_1=40(3) s and τ_2=221(9) s. The bursts occurred at a persistent luminosity of L_{per}=8.3x10E36 erg/s. For the intermediate long burst the mass accretion rate per unit area onto the NS was \dot{m}=4x10E3 g/cm2/s, and the total energy released was E_{burst}=3.5x10E40 erg. This corresponds to an ignition column depth of y_{ign}=1.8x10E9 g/cm2, for a pure helium burning. We find that the energetics of this burst can be modeled in different ways, as (i) pure helium ignition, as the result of either pure helium accretion or depletion of hydrogen by steady burning during accumulation, or (ii) as ignition of a thick layer of hydrogen-rich material in a source with low metallicity. However, comparison of the burst duration with model light curves suggests that hydrogen burning plays a role during the burst, and therefore this source is a low accretion rate burster with a low metallicity in the accreted material.
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