An X-ray and optical study of the outbursting behaviour of the SMC Be X-ray binary SXP 91.1

An X-ray and optical study of the outbursting behaviour of the SMC Be X-ray binary SXP 91.1
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对 SMC Be X 射线双星 SXP 91.1 爆发行为的 X 射线和光学研究

DOI:
10.1093/mnras/stz2262
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发表时间:
2019
影响因子:
4.8
通讯作者:
Monageng I
Monageng I
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Monageng I

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在本文中,我们报告的光学和X射线行为的Be X射线双星,SXP 91.1,在最近的I型爆发。我们用尼尔·格里尔斯斯威夫特天文台监测了这次爆发。这些数据得到了南部非洲大型望远镜和光学引力透镜实验(OGLE)的光学数据的支持,以显示星周盘的活动。来自这个圆盘的物质吸积到中子星星上,产生了X射线爆发,这在光学和X射线光变曲线的同步演化中可以看到。使用OGLE的数据,我们表明,拱星盘表现出稳定的行为超过二十年。OGLE和大质量致密晕天体观测的颜色和星等之间存在正相关,这表明盘的倾角相对较低。从OGLE andSwift数据,我们证明了该系统已显示出相对相位偏移,已持续多年。自旋周期的衍生物被认为是在最大的自旋时,质量吸积率是在最大的阶段。我们表明,中子星星在SXP 91.1是一个不寻常的成员,在这个意义上说,它已经有一个一致的旋转周期衍生物多年来,平均自旋率是已知的小麦哲伦星云恒星中最高的。最近对自旋加速率的测量显示,数值高于全球趋势,这是由于最近的质量吸积事件导致了当前的爆发。
In this paper we report on the optical and X-ray behaviour of the Be X-ray binary, SXP 91.1, during a recent type I outburst. We monitored the outburst using the Neil GehrelsSwiftObservatory. These data were supported by optical data from the Southern African Large Telescope and the Optical Gravitational Lensing Experiment (OGLE) to show the circumstellar disc activity. Matter from this disc accretes on to the neutron star, giving rise to the X-ray outburst as seen in the synchronous evolution of the optical and X-ray light curves. Using data taken with OGLE we show that the circumstellar disc has exhibited stable behaviour over two decades. A positive correlation is seen between the colour and magnitude from the OGLE and massive compact halo object observations, which indicates that the disc is orientated at relatively low-inclination angles. From the OGLE andSwiftdata, we demonstrate that the system has shown relative phase offsets that have persisted for many years. The spin period derivative is seen to be at maximum spin-up at phases when the mass accretion rate is at maximum. We show that the neutron star in SXP 91.1 is an unusual member of its class in the sense that it has had a consistent spin period derivative over many years, with the average spin-up rate being one of the highest for known Small Magellanic Cloud pulsars. The most recent measurements of the spin-up rate reveal higher values than the global trend, which is attributed to the recent mass accretion event leading to the current outburst.
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