1 SWASP J093010.78 + 533859.5：一个可能的五元组系统
1SWASP J093010.78+533859.5: A Possible Hierarchical Quintuple System
摘要：
本文给出了这类罕见天体1SWASP J093010.78 + 533859.5的观测结果，它的双反射特征在SuperWASP测光档案中已被探测到。在这项研究中，第一次对两个相距约1.9角秒的物体进行了单独的PSF测光。我们的时间序列测光数据证实了Lohr等人（2013）的发现，即明亮的物体A是Algol型的分离食双星，而较暗的物体B是W UMa型的接触食双星。利用高分辨光谱，我们得到了系统A的径向速度变化。此外，探测到的静止谱线必定是来自另一个先前未被识别的恒星成分。这一点得到了来自光变曲线分析的第三个物体贡献的证实。没有检测到系统B的光谱特征，可能是由于长曝光时间的运动模糊。通过光变曲线合成，我们分别得到了有径向速度和无径向速度时系统A和B的二元参数和绝对维数。系统A的主成分和次成分的谱型分别为K1和K5主层序。系统B的两个组分具有几乎相同类型的K3主层序。两个双星的光的变化令人满意的模型，使用两点模型，每个组件上的一个星点。我们分别估计了到系统A和B的距离。两个系统可能有相似的距离，大约70 pc，似乎是以大约130 AU的距离引力束缚的。因此，我们认为1SWASP J093010.78 + 533859.5是一个五恒星系统，具有三元系统A（ab）c和二元系统B（ab）c的等级结构。
英文摘要：
We present the observational results of this kind of rare object 1SWASP J093010.78+533859.5, for which the doubly eclips- ing feature had been detected previously from the SuperWASP photometric archive. Individual PSF photometry for two objects with a separation of about 1.9 arcsec was performed for the first time in this study. Our time-series photometric data confirms the finding of Lohr et al. (2013) that the bright object A is an Algol-type detached eclipsing binary and the fainter B is a W UMa-type contact eclipsing. Using the high- resolution optical spectra, we obtained well-defined radial velocity variations of system A. Furthermore, stationary spectral lines were detected that must have originated from a further, previously unrecognized stellar component. It was confirmed by the third object contribution from the light curve analysis. No spectral feature of the system B was detected, probably due to motion blur by long exposure time. We obtained the binary parameters and the absolute dimensions of the systems A and B from light curve synthesis with and without radial velocities, respectively. The primary and secondary components of system A have a spectral type of K1 and K5 main sequences, respec- tively. Two components of system B have nearly the same type of K3 main sequence. Light variations for both binaries are satisfactorily modeled by using two-spot models with one starspot on each component. We estimated the distances to systems A and B individually. Two systems may have similar distances of about 70 pc and seem to be gravitationally bound with a separation of about 130 AU. In conclusion, we suggest that 1SWASP J093010.78+533859.5 is a quintuple stellar system with a hierarchical structure of a triple system A(ab)c and a binary system B(ab).
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