Multi-wavelength observations of the unusual soft X-ray transient ASASSN-16oh

A. Rajoelimanana, P. Charles, D. Buckley, P. Meintjes
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Abstract

We present our results from the analysis of optical and X-ray observations of the unusual X-ray transient ASASSN-16oh. The optical light curve revealed that at quiescence the source was fainter ($I$ = 20.3) and brightened up to $I$ = 15 during the outburst. The outburst light curve looks remarkably symmetric, with a total duration of $\sim$300 days. The optical spectra from SALT show a strong emission line of He II $\lambda$4686, He I and some weak Balmer lines. The X-ray and near ultraviolet fluxes correlate with the optical brightness. Such behavior is unusual amongst the known supersoft sources (hereafter SSS), and is difficult to assimilate into the standard model, but whatever the cause, a period of significantly enhanced mass transfer from the donor is required.
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异常软x射线瞬变ASASSN-16oh的多波长观测
我们提出了对不寻常的x射线瞬变ASASSN-16oh的光学和x射线观测分析的结果。光学光曲线显示,在静止时,光源较暗($I$ = 20.3),在爆发时变亮至$I$ = 15。爆发光曲线看起来非常对称,总持续时间为$\sim$ 300天。SALT的光谱显示出He II $\lambda$ 4686、He I和一些弱的Balmer谱线的强发射线。x射线和近紫外通量与光学亮度相关。这种行为在已知的超软源(以下简称SSS)中是不寻常的,并且很难被同化到标准模型中,但无论原因是什么,都需要一段时间来显著增强供体的传质。
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