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arXiv 2310.07293astro-ph.HEastro-ph.SR
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Swift J0503.7-2819的多波段研究:一个嵌合型磁性激变变星

A Multi-wavelength Study of Swift J0503.7-2819: a Chimeric magnetic CV

Kala G. Pradeep, Kulinder Pal Singh, G. C. Dewangan, Elias Aydi, P. E. Barrett, D. A. H. Buckley, V. Girish, K. L. Page, S. B. Potter, E. M. Schlegel

AI总结:

本研究通过多波段观测分析磁性激变变星Swift J0503.7-2819,确定其轨道与自旋周期,提出环状吸积流模型,并归类为EX Hya型近乎同步系统,揭示MCV类别间的谱系联系。

摘要:

我们利用AstroSat的远紫外(FUV)和X射线数据,辅以南方非洲大型望远镜的光学数据以及XMM-Newton和Swift天文台的X射线数据,展示了磁性激变变星(MCV)Swift J0503.7-2819的多波段时间和光谱特征。在4897.6657秒和3932.0355秒处的X射线调制分别被解释为轨道周期($P_Ω$)和自旋周期($P_ω$),与先前报告一致。自旋-轨道周期比为0.8,且$P_Ω$低于激变变星(CV)的周期间隙(2-3小时),Swift J0503.7-2819将成为近乎同步MCV(我们称之为EX Hya型系统)这一不断增长群体中的最新成员。通过Swift爆发警报望远镜测量的硬X射线光度小于$2.5\ imes10^{32} erg s^{-1}$,将其识别为低光度中间偏振星,类似于其他EX Hya型系统。光变曲线的现象学和光谱特征排除了纯盘供积/流供积模型,反而揭示了白矮星周围存在复杂的吸积结构。我们利用周期比、稳定性论证和观测特征,提出了类似于EX Hya的环状吸积流。我们还尝试区分Swift J0503.7-2819的异步偏振星/近乎同步中间偏振星性质。此外,我们注意到,随着灵敏巡天的出现,越来越多同时表现出偏振星和中间偏振星特征的MCV开始被识别,它们可能在MCV的两个传统类别之间形成谱系联系。

英文摘要:

We present multi-wavelength temporal and spectral characteristics of a magnetic cataclysmic variable (MCV) Swift J0503.7-2819, using far ultraviolet (FUV) and X-ray data from AstroSat, supplemented with optical data from the Southern African Large Telescope and X-ray data from the XMM-Newton and Swift observatories. The X-ray modulations at 4897.6657 s and 3932.0355 s are interpreted as the orbital ($P_Ω$) and spin ($P_ω$) period, respectively, and are consistent with prior reports. With a spin-orbit period ratio of 0.8 and $P_Ω$ falling below the period gap (2-3 hrs) of CVs, Swift J0503.7-2819 would be the newest addition to the growing population of nearly synchronous MCVs, which we call EX Hya-like systems. Hard X-ray luminosity of $<$ $2.5\times10^{32} erg s^{-1}$, as measured with the Swift Burst Alert Telescope, identifies it to be a low-luminosity intermediate polar, similar to other EX Hya-like systems. The phenomenology of the light curves and the spectral characteristics rule out a purely disc-fed/stream-fed model and instead reveal the presence of complex accretion structures around the white dwarf. We propose a ring-like accretion flow, akin to EX Hya, using period ratio, stability arguments, and observational features. An attempt is made to differentiate between the asynchronous polar/nearly-synchronous intermediate polar nature of Swift J0503.7-2819. Further, we note that with the advent of sensitive surveys, a growing population of MCVs that exhibit characteristics of both polars and intermediate polars is beginning to be identified, likely forming a genealogical link between the two conventional classes of MCVs.

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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