中极MU Camelopardalis的吸积态变化
The changing accretion states of the intermediate polar MU Camelopardalis
摘要：
我们研究了中极型鹿豹座MU（1RXS J062518.2+733433）的时间和光谱性质，以确定吸积模式和吸积几何。提取了不同观测能量范围（光学、UV、X射线）的光变曲线。使用方差分析确定这些光变曲线的变异性时间尺度。相对于最突出的检测到的周期性创建相位分辨X射线光谱，并且每个光谱都用相同的模型拟合，以量化拟合分量中的差异。已发表的自旋周期的暂定值与白矮星的自转周期是一致的。我们检测到一个独特的软X射线组件，可以很好地再现了一个黑体。在不同时期获得的数据的分析表明，该系统正在改变其吸积几何形状从磁盘为主的磁盘加流为主的组合，伴随着在光学波长的亮度显着变化。
英文摘要：
We study the timing and spectral properties of the intermediate polar MU Camelopardalis (1RXS J062518.2+733433) to determine the accretion modes and the accretion geometry from multi-wavelength, multi-epoch observational data. Light curves in different observed energy ranges (optical, UV, X-ray) are extracted. The timescales of variability in these light curves are determined using Analysis of Variance. Phase-resolved X-ray spectra are created with respect to the most prominent detected periodicities and each fitted with an identical model, to quantify the differences in the fitted components. The published tentative value for the spin period is unambiguously identified with the rotation period of the white dwarf. We detect a distinct soft X-ray component that can be reproduced well by a black body. The analysis of data obtained at different epochs demonstrates that the system is changing its accretion geometry from disk-dominated to a combination of disk- plus stream-dominated, accompanied with a significant change in brightness at optical wavelengths.
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