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首页> 外文期刊>The Astrophysical journal >ULTRACOMPACT X--RAY BINARlES lN GLOBULAR CLUSTERS: VARIABILITY OF THE OPTICAL COUNTERPART OF X1832-330 IN NGC 6652
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ULTRACOMPACT X--RAY BINARlES lN GLOBULAR CLUSTERS: VARIABILITY OF THE OPTICAL COUNTERPART OF X1832-330 IN NGC 6652

机译：超紧凑X射线双线性lN球状团簇：NGC 6652中X1832-330的光学配偶的变异性

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摘要

Evidence is emerging that the luminous X-ray sources in the cores of globular clusters may often consist of , or perhaps even as a class be dominated by, ultracompact (P ≈＜ 1 hr) binary stars. TO the two such systems already known, in NGC 6624 and NGC 6712, we now add evidence for two more. We detect large-amplitude variability in the candidate optical counterpart for the X-ray source in the core of NGC 6652. Although the available observations are relatively brief, the existing Hubble Space Telescope data indicate a strong 43.6 minute periodic modulation of the visible flux of semiamplitude 30/100. Further, although the orbital period of the source in NGC 1851 is not yet explicitly measured, we demonstrate that previous correlations of optical luminosity with X--ray luminosity and accretion disk size, strengthened by recent data, strongly imply that the period of that system is also less than 1 hr Thus, currently there is evidence that four of the seven globular cluster X-ray sources with constrained periods are ultracompact, a fraction far greater than that found in X-ray binaries the field.
机译：越来越多的证据表明，球状星团核心中的发光X射线源可能通常由超紧凑型（P≈＜1 hr）双星构成，或者甚至可能由一类超紧凑双星构成。对于NGC 6624和NGC 6712这两个已知的系统，我们现在添加另外两个证据。我们在NGC 6652的核心中的X射线源的候选光学对应物中检测到大幅度变化。尽管可用的观察相对简短，但现有的哈勃太空望远镜数据表明，对可见光通量有43.6分钟的强周期性调制半振幅30/100。此外，尽管尚未明确测量NGC 1851中源的轨道周期，但我们证明了以前的光学发光度与X射线发光度和吸积盘尺寸之间的相关性（最近的数据加强）强烈暗示了该系统的周期距离小于1小时。因此，目前有证据表明，周期受限制的七个球状X射线源中有四个是超紧凑的，远大于该领域X射线双星中发现的那个。

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