论文标题
暂定114分钟的轨道时期挑战X射线二进制4U 1812-12的超紧凑性质
A tentative 114-minute orbital period challenges the ultra-compact nature of the X-ray binary 4U 1812-12
论文作者
论文摘要
我们提出了超紧凑型X射线二进制候选者4U 1812-12的详细时间分辨光度研究。在10.4米Gran telescopio canarias上用hipercam获得的多色光曲线显示APROX 114 min调制类似于超级人。在这种解释下，这个时期应该非常接近系统的轨道时期。与其其他观察性特性所暗示的相反（即，持续的昏暗光度，低光学与X射线通量比和光谱中缺乏氢特征），这意味着4U1812-12很可能不是超级X射线二进制的4U1812-12，通常定义为具有诸如或80分钟的系统的系统。我们讨论了系统的性质，表明4U 1812-12是超紧凑型X射线二进制的祖细胞可能会调和所有可观察到的情况。
We present a detailed time-resolved photometric study of the ultra-compact X-ray binary candidate 4U 1812-12. The multicolor light curves obtained with HiPERCAM on the 10.4-m Gran Telescopio Canarias show an aprox 114 min modulation similar to a superhump. Under this interpretation, this period should lie very close to the orbital period of the system. Contrary to what its other observational properties suggest (namely, persistent dim luminosity, low optical-to-X-ray flux ratio and lack of hydrogen features in the optical spectrum), this implies that 4U1812-12 is most likely not an ultra-compact X-ray binary, which are usually defined as systems with orbital periods lower than 80 min. We discuss the nature of the system, showing that a scenario in which 4U 1812-12 is the progenitor of an ultra-compact X-ray binary may reconcile all the observables.
