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High-State Observations of the Eclipsing AM Herculis Object UZ Fornacis

机译:掩盖AM Herculis天体UZ菌的高状态观测

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We present high-speed optical photometric observations of the eclipsing AM Her object UZ For that were obtained during 1995 February and October at the Cerro Tololo Inter-American Observatory. On both occasions, UZ For was in its high-luminosity state. In 1995 February, UZ had peak visual magnitude mV ≈ 15.9 ± 0.1 mag, which is roughly 0.5-1 mag brighter than previous reports of its high-state brightness level. In 1995 October, UZ For had peak magnitude mV ≈ 16.75 ± 0.25 mag, which is more similar to earlier reports of its high-state brightness level. The 1995 February light curves and eclipses are different in appearance from those for the lower luminosity states of UZ For reported in the literature. The eclipses are, however, similar to those of other AM Her systems, e.g., they are similar in shape to the eclipses of RE 2107-05 (HU Aqr) and to the ultraviolet eclipses of UZ For. The significance of the last statement is that in both of these systems, the accretion stream contributes a significant fraction of the overall luminosity of the system. In the low-luminosity state of UZ For, the accretion hot spot and the white dwarf photosphere dominate the optical emission. Here, we conclude that in the high-luminosity state, the accretion stream makes a significant contribution (and sometimes dominates) the optical emission from UZ For.
机译:我们介绍了日蚀AM她的天体UZ的高速光学测光观测,这些观测是在1995年2月和10月期间在塞罗·托洛洛美洲观测站获得的。在两种情况下,UZ For都处于高发光状态。 1995年2月,UZ的视觉峰值幅度mV≈15.9±0.1 mag,比以前的高态亮度水平报告高出大约0.5-1 mag。在1995年10月,UZ For的峰值幅度mV≈16.75±0.25 mag,这与早期有关其高亮度状态的报道更为相似。 1995年2月的光曲线和日食在外观上与UZ的较低发光度状态不同。但是,日食与其他AM Her系统的日食相似,例如,它们的形状类似于RE 2107-05(HU Aqr)的日食和UZ For的紫外线食。最后一个声明的意义在于,在这两个系统中,吸积流在系统的总体亮度中占很大比例。在UZ For的低发光状态下,积聚热点和白矮星光球主导着光发射。在这里,我们得出结论,在高发光度状态下,吸积流对UZ For的光发射做出了重大贡献(有时是主要的)。

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