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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >OAO/MITSuME photometry of dwarf novae. I. SU ursae majoris
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OAO/MITSuME photometry of dwarf novae. I. SU ursae majoris

机译：矮新星的OAO / MITSuME光度法。 I. SU ursae majoris

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摘要

We report on simultaneous g', Rc, and Ic photometry of SU Ursae Majoris during 2011 December-2012 February using OAO/MITSuME. Our photometry revealed that quiescence is divided into three types based on the magnitude and color. Quiescent light curves showed complicated profiles with various amplitudes and time scales. Although no superoutbursts were observed during our run, five normal outbursts occurred with intervals of 11-21 d. The shapes of the normal outbursts were characteristic of the outside-in type. During the rising phase of a normal outburst, the light curve showed periodic modulations with a period of ?0.048111(354) d, but the origin of this peirod was unclear. We examined daily averaged color-color diagrams, and found that two cycles exist. This implies that the thermal limit cycle in SUUMa is complicated. We newly discovered that g' - R_c becomes red about 3 days prior to an outburst. Although the working mechanism on this reddening is unclear, we propose two possibilities: one is that the inner portion of the accretion disk is filled by matter and obscures the central white dwarf; the other is that the stagnation effect works in the outer region of the accretion disk.
机译：我们报告了使用OAO / MITSuME在2011年12月至2012年2月期间同时对SU Ursae Majoris进行g'，Rc和Ic光度测定的报告。我们的光度法显示，根据大小和颜色，静态分为三种类型。静态光曲线显示了具有各种幅度和时间范围的复杂轮廓。尽管在我们的跑步过程中未观察到超强爆发，但在11-21 d的间隔内发生了5次正常爆发。正常爆发的形状是由内而外的特征。在正常爆发的上升阶段，光曲线显示出周期性调制，周期为？0.048111（354）d，但是该比罗的起源尚不清楚。我们检查了每日平均颜色-彩色图表，发现存在两个周期。这意味着SUUMa中的热极限循环很复杂。我们新发现g'-R_c在爆发前3天变成红色。尽管这种变红的工作机理尚不清楚，但我们提出了两种可能性：一种是吸积盘的内部被物质填充，并遮盖了中央白矮星。另一个是停滞效应在吸积盘的外部区域起作用。

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