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arXiv 0810.1523astro-ph
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2007年X射线双星XTE J1856 +053的爆发

The 2007 outburst of the X-ray binary XTE J1856+053

G. Sala, J. Greiner, M. Ajello, N. Primak

摘要:

2007年2月28日,RXTE/ASM探测到先前已知的瞬变源XTE J1856+053的新爆发。我们在这里提出的XMM-牛顿(0.5-10.0千电子伏)的机会观测目标于2007年3月14日进行的结果,旨在约束在此X射线二进制的紧凑对象的质量,并确定其主要属性。EPIC-pn相机用于定时模式,其光谱与RGS数据拟合在一起。在拉西拉的2.2米望远镜上用GROND进行的红外观测提供了关于该系统的进一步信息。X射线光变曲线显示,1996年和2007年的爆发都有两个峰值。X射线谱符合热吸积盘模型,kT=0.75 ± 0.01 keV,前景吸收NH =4.5(± 0.1 μ E22 cm**-2).低的盘温度有利于黑洞作为吸积物体,估计质量在1.3-4.2 M_sun之间。从红外光谱的上限值出发,我们认为XTE J1856+053是一颗低质量的X射线双星。我们估计该系统的轨道周期在3到12小时之间。

英文摘要:

On 28 February 2007 a new outburst of the previously known transient source XTE J1856+053 was detected with RXTE/ASM. We present here the results of an XMM-Newton (0.5-10.0 keV) Target of Opportunity observation performed on 14 March 2007, aimed at constraining the mass of the compact object in this X-ray binary and determining its main properties. The EPIC-pn camera was used in Timing mode and its spectrum fit together with the RGS data. IR observations with GROND at the 2.2 m telescope in La Silla provide further information on the system. The X-ray light curve shows that both the 1996 and the 2007 outbursts had two peaks. The X-ray spectrum is well fit with a thermal accretion disk model, with kT=0.75+/-0.01 keV and foreground absorption N_H=4.5(+/-0.1)E22 cm**-2. The low disk temperature favours a black-hole as accreting object, with an estimated mass in the range 1.3-4.2 M_sun. From the IR upper limits we argue that XTE J1856+053 is a low mass X-ray binary. We estimate the orbital period of the system to be between 3 and 12 hours.

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