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VZ Sex: X-Ray Confirmation of Its Intermediate Polar Nature
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2021-01-18 , DOI: 10.3847/1538-4357/abc7ca
A. A. Nucita 1, 2, 3 , F. De Paolis 1, 2, 3 , D. Licchelli 4, 5 , F. Strafella 1, 2, 3 , G. Ingrosso 1, 2, 3 , M. Maiorano 1, 2
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Intermediate polars are members of the cataclysmic variable binary stars. They are characterized by a moderately magnetized white dwarf accreting matter from a cool main-sequence companion star. In many cases, this accretion gives rise to a detectable X-ray emission. VZ Sex is an interesting X-ray source whose nature needs a robust confirmation. Here, we used archiveXMM -Newton observation to assign the source to the intermediate polar class. We applied the Lomb-Scargle periodogram method to detect any relevant periodic feature in the 0.1–10 keV light curve and performed a spectral fitting of the X-ray spectrum in order to get information on the on-going accretion mechanism. By inspecting the periodogram, we detected a clear periodic feature at ≃ 20.3 minutes that we interpret as the spin period of the white dwarf. We additionally found the typical side bands expected as the consequence of the beat between the spin and the orbital period of ≃ 3.581 hours. The source is characterized by a unabsorbed flux of ≃ 2.98× 10 erg cm s corresponding to an intrinsic luminosity of ≃ 7× 10 erg s for a distance of ≃ 433 pc. The existence of such features allow us to classify VZ Sex as a clear member of the intermediate polar class. Furthermore, with the estimated WD spin, the ratio Pspin/Porb is ≃ 0.09, i.e. consistent with that expected for a typical IP system above the period gap. In addition, the estimated intrinsic luminosity opens the possibility that a bridge linking the normally bright IPs to the faint population of sources does exist.

中文翻译:

VZ 性别:X 射线确认其中间极地性质

中极星是灾难变双星的成员。它们的特点是中等磁化的白矮星吸积来自冷主序伴星的物质。在许多情况下,这种吸积会产生可检测的 X 射线发射。VZ Sex 是一种有趣的 X 射线源,其性质需要可靠的确认。在这里,我们使用 archiveXMM -Newton 观察将源分配给中间极地类。我们应用 Lomb-Scargle 周期图方法来检测 0.1-10 keV 光变曲线中的任何相关周期性特征,并对 X 射线光谱进行光谱拟合,以获得有关正在进行的吸积机制的信息。通过检查周期图,我们在≃ 20.3 分钟处检测到一个清晰的周期特征,我们将其解释为白矮星的自旋周期。我们还发现了典型的边带,这是自旋和 ≃ 3.581 小时的轨道周期之间节拍的结果。该光源的特征是未吸收通量 ≃ 2.98× 10 erg cm s 对应于≃ 7× 10 erg s 的固有光度,距离≃ 433 pc。这些特征的存在使我们能够将 VZ Sex 归类为中间极地类的明确成员。此外,对于估计的 WD 自旋,Pspin/Porb 的比率 ≃ 0.09,即与周期间隙以上典型 IP 系统的预期一致。此外,估计的固有光度开启了将正常明亮的 IP 与微弱的光源群连接起来的桥梁的可能性。该光源的特征是未吸收通量 ≃ 2.98× 10 erg cm s 对应于≃ 7× 10 erg s 的固有光度,距离≃ 433 pc。这些特征的存在使我们能够将 VZ Sex 归类为中间极地类的明确成员。此外,对于估计的 WD 自旋,Pspin/Porb 的比率 ≃ 0.09,即与周期间隙以上典型 IP 系统的预期一致。此外,估计的固有光度开启了将正常明亮的 IP 与微弱的光源群连接起来的桥梁的可能性。该光源的特征是未吸收通量 ≃ 2.98× 10 erg cm s 对应于≃ 7× 10 erg s 的固有光度,距离≃ 433 pc。这些特征的存在使我们能够将 VZ Sex 归类为中间极地类的明确成员。此外,对于估计的 WD 自旋,Pspin/Porb 的比率 ≃ 0.09,即与周期间隙以上典型 IP 系统的预期一致。此外,估计的固有光度开启了将正常明亮的 IP 与微弱的光源群连接起来的桥梁的可能性。对于估计的 WD 自旋,Pspin/Porb 之比为 ≃ 0.09,即与周期间隙以上典型 IP 系统的预期一致。此外,估计的固有光度开启了将正常明亮的 IP 与微弱的光源群连接起来的桥梁的可能性。对于估计的 WD 自旋,Pspin/Porb 之比为 ≃ 0.09,即与周期间隙以上典型 IP 系统的预期一致。此外,估计的固有光度开启了将正常明亮的 IP 与微弱的光源群连接起来的桥梁的可能性。
更新日期:2021-01-18
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