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arXiv 0802.2394astro-ph
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IGR J00291 +5934静止时的观测

Observations of IGR J00291+5934 in quiescence

P. G. Jonker, M. A. P. Torres, D. Steeghs

摘要:

本文报道了吸积动力ms脉冲星IGR J 00291 +5934在静止期的光学和X射线观测结果。时间分辨的I波段测光已获得与4.2米威廉赫歇尔望远镜,而一个3 ks钱德拉观测提供了同期的X射线覆盖。我们发现0.5-10 keV的未吸收X射线通量为1 × 10 ^-13 erg cm-2 s-1,这意味着在光学观测时,该源处于静止状态。然而,IGR J 00291 +5934的光学I波段光变曲线显示了强烈的耀斑。去除最强的耀斑后,我们发现在相位折叠的I波段光变曲线的轨道调制的证据。整体调制可以通过由超级驼峰的存在而产生的效应来描述。将我们的光变曲线与最近报道的光变曲线进行比较,我们发现了静止基准面变化的证据。类似的变化,现在已经报告了4软X射线瞬态暗示他们可能是一个共同的特点,这样的系统在静止。此外,在我们的折叠光变曲线的最大值发生在一个不同的阶段比以前观察到的。

英文摘要:

We report on optical and X-ray observations of the accretion powered ms pulsar IGR J00291+5934 in quiescence. Time resolved I-band photometry has been obtained with the 4.2 m William Herschel Telescope, while a 3 ks Chandra observation provided contemporaneous X-ray coverage. We found an unabsorbed 0.5-10 keV X-ray flux of 1x10^-13 erg cm-2 s-1 which implies that the source was in quiescence at the time of the optical observations. Nevertheless, the optical I-band light curve of IGR J00291+5934 shows evidence for strong flaring. After removal of the strongest flares, we find evidence for an orbital modulation in the phase folded I-band light curve. The overall modulation can be described by effects resulting from the presence of a superhump. Comparing our lightcurve with that reported recently we find evidence for a change in the quiescent base level. Similar changes have now been reported for 4 soft X-ray transients implying that they may be a common feature of such systems in quiescence. Furthermore, the maximum in our folded lightcurve occurs at a different phase than observed before.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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