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arXiv 1702.07341astro-ph.SR
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共生变星中吸积热组分的FUSE谱

FUSE Spectroscopy of the Accreting Hot Components in Symbiotic Variables

Edward Sion, Patrick Godon, Joanna Mikolajewska, Bassem Sabra, Craig Kolobow

摘要:

我们已经进行了光谱分析的远紫外档案光谱的四个共生变量,EG和AE阿拉,CQ Dra和RW Hya。RW Hya和EG And从未记录过爆发,而CQ Dra和AE Ara有爆发历史。我们分析了这些系统,而他们在安静,以帮助揭示其热组分的物理性质,通过比较光学厚吸积盘模型和NLTE模型白矮星光球的观测。我们用FUSE光谱将波长覆盖范围扩展到莱曼极限。我们发现RW Hya中的热成分是一个低质量的白矮星,表面温度为160,000 K。我们重新检查共生系统CQ Dra是否是一个三重系统,其中红巨星将物质转移到由激变变星组成的热组分,其中白矮星的表面温度低至$\sim$ 20,000 K。热分量的非常小的尺寸有助于CQ Dra的FUSE光谱的最短波长与光学厚和几何薄(WD表面的$\sim$ 4\%)热($\sim 120,000$ K)边界层一致。我们对EG And的分析表明,它的热组分是一颗热的、裸露的、低质量的白矮星,表面温度为80-95,000 K,表面重力为$\log(g)= 7.5$。对于AE Ara,我们还发现低重力($\log(g) \sim 6$)热($T \sim 130,000$ K)WD占热分量。

英文摘要:

We have conducted a spectroscopic analysis of the far ultraviolet archival spectra of four symbiotic variables, EG And, AE Ara, CQ Dra and RW Hya. RW Hya and EG And have never had a recorded outburst while CQ Dra and AE Ara have outburst histories. We analyze these systems while they are in quiescence in order to help reveal the physical properties of their hot components via comparisons of the observations with optically thick accretion disk models and NLTE model white dwarf photospheres. We have extended the wavelength coverage down to the Lyman Limit with FUSE spectra. We find that the hot component in RW Hya is a low mass white dwarf with a surface temperature of 160,000K. We re-examine whether or not the symbiotic system CQ Dra is a triple system with a red giant transferring matter to a hot component made up of a cataclysmic variable in which the white dwarf has a surface temperature as low as $\sim$20,000K. The very small size of the hot component contributing to the shortest wavelengths of the FUSE spectrum of CQ Dra agrees with an optically thick and geometrically thin ($\sim$4\% of the WD surface) hot ($\sim 120,000$K) boundary layer. Our analysis of EG And reveals that its hot component is a hot, bare, low mass white dwarf with a surface temperature of 80-95,000K, with a surface gravity $\log(g)= 7.5$. For AE Ara, we also find that a low gravity ($\log(g) \sim 6$) hot ($T \sim 130,000$K) WD accounts for the hot component.

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