Discovery of a possible X-ray triple - 4U 1915-05
Discovery of a possible X-ray triple - 4U 1915-05
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发现可能的 X 射线三重 - 4U 1915-05
DOI：
10.1086/185305
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
G. Wegner
中科院分区：
文献类型：
--
作者：
J. Grindlay;C. Bailyn;H. Cohn;P. Lugger;J. Thorstensen;G. Wegner
50分钟双星和X射线爆发源4U 1915-05的光学对应物已经被确定为21等蓝色物体。广泛的CCD测光观测表明，该系统的光学调制定义了一个高精度的周期为50.4567分钟，因此可能是真正的轨道周期，而之前报道的X射线倾角周期值（49.7-50.1分钟）的范围被排除在外。一个模型，其中的光学调制是由于偏食的吸积盘的边缘由低质量的同伴星星和X射线的倾角是由于吸收和散射的斑点的材料上方和下方的磁盘平面和密度成比例的当前质量传递速率从同伴星星。1%的周期差异可能表明该系统是一个等级三元组，第三颗低质量的伴星星星在大约2.5天的逆行轨道上绕着双星离子运行。这样一个系统的可能起源的潮汐捕获在一个球状星团，因为中断，简要讨论。25篇参考文献。
The optical counterpart of the 50 minute binary and X-ray burst source 4U 1915-05 has been identified with a 21st mag blue object. Extensive CCD photometric observations show that the optical modulation of the system defines a period of 50.4567 minutes with high precision and is thus probably the true orbital period, whereas the range of X-ray ray dip period values (49.7-50.1 minutes) reported previously are excluded. A model is described whereby the optical modulation is due to partial eclipse of the rim of the accretion disk by a low-mass companion star and the X-ray dips are due to absorption and scattering by blobs of material above and below the disk plane and with density proportional to the current mass transfer rate from the companion star. The 1 percent difference in periods may suggest that the system is a hierarchical triple with a third companion star of low-mass orbiting the binary ion in an about 2.5 day retrograde orbit. The possible origin of such a system by tidal capture in a globular cluster, since disrupted, is briefly discussed. 25 references.