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The Symbiotic System SS73 17 Seen with Suzaku

机译：朱雀与共生系统SS73 17

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We observed with Suzaku the symbiotic star SS73 17, motivated by the discovery by the INTEGRAL satelliteand the Swift BAT survey that it emits hard X-rays. Our observations showed a highly-absorbed X-ray spectrumwith NH > 10~(23)cm~(-2), equivalent to A _v > 26, although the source hasBmagnitude 11.3 and is also bright in UV. Thesource also shows strong, narrow iron lines including fluorescent Fe K as well as Fe XXV and Fe XXVI. The X-rayspectrum can be fit with a thermal model including an absorption component that partially covers the source. Mostof the equivalent width of the iron fluorescent line in this model can be explained as a combination of reprocessingin a dense absorber plus reflection off a white dwarf surface, but it is likely that the continuum is partially seenin reflection as well. Unlike other symbiotic systems that show hard X-ray emission (CH Cyg, RT Cru, T CrB,GX 1+4), SS73 17 is not known to have shown nova-like optical variability, X-ray flashes, or pulsations, and hasalways shown faint soft X-ray emission. As a result, although it is likely a white dwarf, the nature of the compactobject in SS73 17 is still uncertain. SS73 17 is probably an extreme example of the recently discovered and relativelysmall class of hard X-ray emitting symbiotic systems.
机译：我们通过朱雀观测到了共生恒星SS73 17，这是由于INTEGRAL卫星和Swift BAT调查发现它发出硬X射线所致。我们的观察结果表明，尽管该源的振幅为11.3，并且在紫外线下也很亮，但NH> 10〜（23）cm〜（-2）时吸收的X射线光谱很高，相当于A _v> 26。来源还显示出强而窄的铁线，包括荧光Fe K以及Fe XXV和Fe XXVI。 X射线光谱可以与热模型拟合，该模型包括部分覆盖源的吸收分量。该模型中大部分铁荧光线的等效宽度可以解释为密集吸收体中的后处理加上白矮星表面的反射的组合，但是在反射中也可能会部分看到连续体。与其他显示强X射线发射的共生系统（CH Cyg，RT Cru，T CrB，GX 1 + 4）不同，SS73 17未知显示出类似新星的光学变异性，X射线闪烁或脉动，并且哈萨尔总是表现出微弱的软X射线发射。结果，尽管可能是白矮星，但SS73 17中紧凑物体的性质仍然不确定。 SS73 17可能是最近发现的且类别相对较小的硬X射线发射共生系统的极端示例。

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