共生双星AG Draconis超软X射线-光学/紫外通量关系的起源
The origin of the supersoft X-ray--optical/UV flux anticorrelation in the symbiotic binary AG Draconis
摘要：
AG Draconis产生强烈的超软X射线辐射，在整个活动期和静止期，X射线和光/紫外辐射通量之间存在严格的线性关系。这一贡献的目的是确定的X射线发射源，并揭示所观察到的磁通量的关系的性质。为此，我们模型的X射线和紫外线观测与XMM牛顿，远紫外光谱从FUSE，低和高分辨率IUE光谱和光学/近红外光谱和/或光度观测。我们的分析表明，超软X射线辐射是由白矮星光球层产生的。X射线和远紫外线通量使明确确定其温度成为可能。超软X射线-光学/紫外通量的关系是由来自热恒星的可变风引起的。增强的热星风通过将莱曼连续谱中的高能光子再加工成光学/紫外光而产生光学爆发。
英文摘要：
AG Draconis produces a strong supersoft X-ray emission.The X-ray and optical/UV fluxes are in a strict anticorrelation throughout the active and quiescent phases. The aim of this contribution is to identify the source of the X-ray emission and reveal the nature of the observed flux anticorrelation. For this purpose we model the X-ray and UV observations with XMM-Newton, far-UV spectroscopy from FUSE, low- and high-resolution IUE spectra and optical/near-IR spectroscopic and/or photometric observations. Our analysis showed that the supersoft X-ray emission is produced by the white dwarf photosphere. The X-ray and far-UV fluxes make it possible to determine its temperature unambiguously. The supersoft X-ray--optical/UV flux anticorrelation is caused by the variable wind from the hot star. The enhanced hot star wind gives rise to the optical bursts by reprocessing high-energy photons from the Lyman continuum to the optical/UV.
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