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首页> 外文期刊>The Astrophysical journal >PHOTOMETRIC PROPERTIES FOR SELECTED ALGOL-TYPE BINARIES. VII. V404 AND WITH MAGNETIC ACTIVITY
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PHOTOMETRIC PROPERTIES FOR SELECTED ALGOL-TYPE BINARIES. VII. V404 AND WITH MAGNETIC ACTIVITY

机译:选定的ALGOL型双线性的光度特性。七。 V404且具有磁性

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We present new CCD light curves of the short-period Algol-type eclipsing binary V404 And obtained in 2009-2011. The time-resolving multiple BVRI color light curves of the year 2011 with full phase coverage were analyzed simultaneously using the latest Wilson-Devinney program. We concluded that the configuration of two starspots on the primary is the most reliable explanation for the light curve distortions observed in 2011. Based on the new photometric solution, we further applied the spot model to explain the other light curves, including the previously published R-band light curves. We revealed that the starspots changed on a long timescale in terms of the spot parameters and the differences between Max. I and Max. II. Moreover, the O – C diagram spanning about 15?yr shows an upward parabola, which indicates a secular increase in the orbital period of V404 And. The orbital period increases at a rate of dP/dt = 5.3(0.3) × 10–7 days yr–1, which might be interpreted by the angular momentum exchange via magnetic activity.
机译:我们提出了2009-2011年获得的短周期Algol型日食二元V404的新CCD光曲线。使用最新的Wilson-Devinney程序,同时分析了2011年的时间分辨多条BVRI彩色光曲线(具有全相位覆盖)。我们得出的结论是,在主星上两个星点的配置是对2011年观察到的光曲线畸变的最可靠的解释。基于新的光度学解决方案,我们进一步应用了点模型来解释其他光曲线,包括先前发布的R带光曲线。我们发现,星点在很长的时间尺度上都发生了变化,这取决于光点参数和最大值之间的差异。我和麦克斯二。此外,跨越约15?yr的O–C图显示了一个向上的抛物线,这表明V404 And的轨道周期长期增加。轨道周期以dP / dt = 5.3(0.3)×10–7天yr–1的速率增加,这可以通过磁活动的角动量交换来解释。

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