论文标题
Swift J004427.3-734801-小型麦哲伦云中的可能是/白色矮人系统
Swift J004427.3-734801- a probable Be/white dwarf system in the Small Magellanic Cloud
论文作者
论文摘要
Swift J004427.3-734801是小型麦哲伦云（SMC）的X射线源，该来源是2020年1月首次作为Swift S-Ib-abile计划的一部分发现的。从X射线数据中的准确位置测定已允许确定具有O9V-B2III星的特征的光学对应物。存在IR过量和显着的I带变异性的证据强烈表明这是OBE型恒星。在17年以上，OGLE项目的光学监测揭示了准周期光耀斑以〜21.5d的间隔发生的时间。从S-cubed项目获得的X射线数据显示出非常柔软的频谱，从积聚到中子恒星或黑洞。这里建议在SMC中很少确定这是星白矮人二元。
Swift J004427.3-734801 is an X-ray source in the Small Magellanic Cloud (SMC) that was first discovered as part of the Swift S-CUBED programme in January 2020. It was not detected in any of the previous 3 years worth of observations. The accurate positional determination from the X-ray data have permitted an optical counterpart to be identified which has the characteristics of an O9V-B2III star. Evidence for the presence of an IR excess and significant I-band variability strongly suggest that this is an OBe type star. Over 17 years worth of optical monitoring by the OGLE project reveal periods of time in which quasi-periodic optical flares occur at intervals of ~21.5d. The X-ray data obtained from the S-CUBED project reveal a very soft spectrum, too soft to be that from accretion on to a neutron star or black hole. It is suggested here that this a rarely identified Be star-white dwarf binary in the SMC.
