arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2107.02664astro-ph.SR
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周期间隔突变变量CzeV404 Her:SW Sex和SU UMa系统之间的联系

The period-gap cataclysmic variable CzeV404 Her: A link between SW Sex and SU UMa systems

J. Kára, S. Zharikov, M. Wolf, H. Kučáková, P. Cagaš, A. L. Medina Rodriguez, M. Mašek

摘要:

背景:我们提出了一个新的研究日食激变变量CzeV404 Her(Porb = 0.098 d),位于周期间隙。目的:确定天体的起源和系统参数,探讨系统的吸积流结构。研究方法:我们对CzeV 404 Her进行了同步的时间分辨光度和光谱观测,应用光变曲线模拟技术和多普勒层析成像方法确定了系统参数,分析了吸积盘的结构。结果如下:我们发现该系统有一个质量较大的白矮星,M_WD = 1.00(2)M_sun,质量比q = 0.16,以及一个相对较热的次级,有效温度T_2 = 4100(50)K。系统倾角为i = 78.8°。吸积盘扩展到潮汐极限半径,并有一个扩展的热点或线区域。在静止或中间状态下,热点或线比盘的其余外部部分更热,但在(超级)爆发中并不完全突出于盘通量。结论:我们认为这个天体代表了SU UMa型和SW Sex型激变变星两个不同类别之间的联系。吸积流结构在磁盘中对应的SW性别系统,但磁盘内的物理条件适合的行为SU UMa型对象。

英文摘要:

Context: We present a new study of the eclipsing cataclysmic variable CzeV404 Her (Porb = 0.098 d) that is located in the period gap. Aims: This report determines the origin of the object and the system parameters and probes the accretion flow structure of the system. Methods: We conducted simultaneous time-resolved photometric and spectroscopic observations of CzeV404 Her. We applied our light-curve modelling techniques and the Doppler tomography method to determine the system parameters and analyse the structure of the accretion disk. Results: We found that the system has a massive white dwarf M_WD = 1.00(2) M_sun a mass ratio of q = 0.16, and a relatively hot secondary with an effective temperature T_2 = 4100(50) K. The system inclination is i = 78.8°. The accretion disk spreads out to the tidal limitation radius and has an extended hot spot or line region. The hot spot or line is hotter than the remaining outer part of the disk in quiescence or in intermediate state, but does not stand out completely from the disk flux in (super)outbursts. Conclusions: We claim that this object represents a link between two distinct classes of SU UMa-type and SW Sex-type cataclysmic variables. The accretion flow structure in the disk corresponds to the SW Sex systems, but the physical conditions inside the disk fit the behaviour of SU UMa-type objects.

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