MV Lyr的XMM-牛顿观测及夹层模型的验证
XMM-Newton observation of MV Lyr and the sandwiched model confirmation
摘要：
我们提出了光谱和时间分析的同时X射线和紫外线观测的VY Scl系统MV Lyr采取XMM-牛顿，包含最长的连续X射线+紫外光曲线和最高的信号噪声X射线（EPIC）光谱。RGS光谱显示发射线加上连续谱，确认模型方法是基于热等离子体模型。我们测试的三明治模型的基础上快速的变化，预测一个几何厚的日冕，围绕一个内部的几何薄盘。的EPIC光谱是一致的冷却流模型或2-T碰撞等离子体加Fe发射线，其中较热的成分可能会被部分吸收，然后将起源于一个中央电晕或部分模糊的边界层，分别。冷却流模型产生一个较低的质量吸积率比预期在明亮的状态，这表明蒸发等离子体具有低密度，从而符合电晕。定时分析证实了在X射线功率密度谱（PDS）中存在log（f/Hz）= -3左右的主导断裂频率，如在光学PDS中一样。复杂的软/硬X射线光变曲线行为与靠近白矮星的区域是一致的，在那里产生了热的成分。软部件可以连接到延伸区域。我们在log（f/Hz）= -3.4附近发现了另一个断裂频率，这也是开普勒探测到的。我们比较了不同波长的耀斑，发现峰值是同时出现的，但在X射线中上升到最大值的时间相对于紫外线是延迟的。
英文摘要：
We present spectral and timing analyses of simultaneous X-ray and UV observations of the VY Scl system MV Lyr taken by XMM-Newton, containing the longest continuous X-ray+UV light curve and highest signal-to-noise X-ray (EPIC) spectrum to date. The RGS spectrum displays emission lines plus continuum, confirming model approaches to be based on thermal plasma models. We test the sandwiched model based on fast variability that predicts a geometrically thick corona that surrounds an inner geometrically thin disc. The EPIC spectra are consistent with either a cooling flow model or a 2-T collisional plasma plus Fe emission lines in which the hotter component may be partially absorbed which would then originate in a central corona or a partially obscured boundary layer, respectively. The cooling flow model yields a lower mass accretion rate than expected during the bright state, suggesting an evaporated plasma with a low density, thus consistent with a corona. Timing analysis confirms the presence of a dominant break frequency around log(f/Hz) = -3 in the X-ray Power Density Spectrum (PDS) as in the optical PDS. The complex soft/hard X-ray light curve behaviour is consistent with a region close to the white dwarf where the hot component is generated. The soft component can be connected to an extended region. We find another break frequency around log(f/Hz) = -3.4 that is also detected by Kepler. We compared flares at different wavelengths and found that the peaks are simultaneous but the rise to maximum is delayed in X-rays with respect to UV.
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