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arXiv 2106.14541astro-ph.HE
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Be/X射线双星A0538-66耀斑的eROSITA探测

eROSITA detection of flares from the Be/X-ray binary A0538-66

L. Ducci, S. Mereghetti, A. Santangelo, L. Ji, S. Carpano, S. Covino, V. Doroshenko, F. Haberl, C. Maitra, I. Kreykenbohm, A. Udalski

摘要:

2018年,XMM-牛顿观测到Be/X射线双星(Be/XRB)A0538-66的X射线觉醒。它显示出接近近星点的明亮而快速的耀斑,具有以前从未在其他Be/XRB中观察到的特性。我们报告的结果,从A0538-66收集的第一次全天空调查的eROSITA,一个X射线望远镜(0.2-10千电子伏)上的Spektrum-Roentgen-Gamma(SRG)卫星。eROSITA在一个轨道周期内捕获了两个耀斑,其轨道相位为$ϕ= 0.29$和$ϕ= 0.93$(其中$ϕ=0$对应于近星点),峰值亮度为$\sim 2-4 \times 10^{36}$ erg/s(0.2-10 keV),持续时间为$42 \leq Δt_{\rm fl} \leq 5.7\times 10^4$ s。在$ϕ\approx 0.29$观测到的耀斑表明,中子星可以在离近星点相当远的地方吸积,尽管它预计会在星周盘之外,从而提供了有关双星系统周围等离子体环境的重要新信息。我们还报告了1993年1月至2020年3月期间使用REM、OGLE和MACHO望远镜对A0538-66进行光度监测的结果。我们发现,两个尖锐的峰值,表征轨道调制的光学发生在轨道上不对称,相对于施主星的位置。

英文摘要:

In 2018, XMM-Newton observed the awakening in X-rays of the Be/X-ray binary (Be/XRB) A0538-66. It showed bright and fast flares close to periastron with properties that had never been observed in other Be/XRBs before. We report the results from the observations of A0538-66 collected during the first all-sky survey of eROSITA, an X-ray telescope (0.2-10 keV) on board the Spektrum-Roentgen-Gamma (SRG) satellite. eROSITA caught two flares within one orbital cycle at orbital phases $ϕ= 0.29$ and $ϕ= 0.93$ (where $ϕ=0$ corresponds to periastron), with peak luminosities of $\sim 2-4 \times 10^{36}$ erg/s (0.2-10 keV) and durations of $42 \leq Δt_{\rm fl} \leq 5.7\times 10^4$ s. The flare observed at $ϕ\approx 0.29$ shows that the neutron star can accrete considerably far from periastron, although it is expected to be outside of the circumstellar disk, thus providing important new information about the plasma environment surrounding the binary system. We also report the results from the photometric monitoring of A0538-66 carried out with the REM, OGLE, and MACHO telescopes from January 1993 until March 2020. We found that the two sharp peaks that characterize the orbital modulation in the optical occur asymmetrically in the orbit, relative to the position of the donor star.

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