论文标题
HP CET和Swift J0820.6-2805：XMM-Newton观察到的两个候选中间球
HP Cet and Swift J0820.6-2805: two candidate intermediate polars observed by XMM-Newton
论文作者
论文摘要
我们报告了HP CET和SWIFT J0820.6-2805的XMM-Newton观察结果，这是两个X射线光子源，它们是候选者，它们是中级极性类别灾难变量的成员。如果HP CET的历史光学曲线在$ \ simeq 96 $分钟处显示出周期性功能，则缺乏缺乏高能频段中这种签名的明确识别（与Rosat Satellite检测到的$ \ simeq 8 $分钟的可变性相距甚远）。通过使用XMM-Newton存档数据，我们清楚地确定了一项功能（$ \ simeq 88 $分钟），该功能与文献中报告的二进制系统轨道周期之一略有一致。我们还发现了$ \ simeq 5.6 $分钟的时间尺度上的定期功能的签名。在Swift J0820.6-2805的情况下，以前不清楚中间极性，轨道和白矮旋转周期尚不清楚。在这里，0.3-10 KEV数据无疑揭示了轨道时期和$ \ simeq 87.5 $分钟和$ \ simeq 27.9 $分钟的白色矮人旋转。光谱分析表明，HP CET和SWIFT J0820.6-280都是发光IP子类的成员S $^{ - 1} $。
We report on the XMM-Newton observation of HP Cet and Swift J0820.6-2805, two X-ray photon sources that are candidates to be members of the intermediate polar class of cataclysmic variables. If the historical optical light curve of HP Cet shows a periodic feature at $\simeq 96$ minutes, a clear identification of such a signature in the high energy band (apart for a variability on a time scale of $\simeq 8$ minutes as detected by the ROSAT satellite) is lacking. By using XMM-Newton archive data, we clearly identify a feature (at $\simeq 88$ minutes) which is marginally consistent with one of the binary system orbital periods reported in the literature. We also found a signature of a periodic features on the time scale of $\simeq 5.6$ minutes. In the case of Swift J0820.6-2805, the intermediate polar nature was previously unclear and the orbital and the white dwarf spin periods were unknown. Here, the 0.3-10 keV data undoubtedly reveal an orbital period and a white dwarf spin of $\simeq 87.5$ minutes and $\simeq 27.9$ minutes, respectively. The spectral analysis showed that both HP Cet and Swift J0820.6-280 are members of the under-luminous IP subclass since their luminosity in the $0.3-10$ keV band is estimated to be $\simeq 5\times 10^{30}$ erg s$^{-1}$ and $\simeq 3.8\times 10^{29}$ erg s$^{-1}$, respectively.
