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arXiv 0907.1407astro-ph.SR
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2006年英仙座GK不寻常的矮新星爆发

The unusual 2006 dwarf nova outburst of GK Perseii

P. A. Evans, A. P. Beardmore, J. P. Osborne, G. A. Wynn

摘要:

2006年英仙座GK的爆发在光学和紫外波长上与该天体的典型爆发有很大不同。我们提出了多波长(X射线,紫外线和光学)斯威夫特和AAVSO数据,提供前所未有的宽带覆盖的爆发,使我们能够遵循这些波长的演变比正常的2006年爆发。在光学和紫外线中,我们看到一个三峰形态,最大亮度比往年低约1.5个星等。相比之下,硬X射线通量峰值与之前的爆发相同。我们解决这个二分法证明,硬X射线通量仅占吸积过程中释放的总能量的一小部分,并解释的光学/紫外线爆发轮廓所产生的一系列加热和冷却波穿越光盘,其可变的密度分布造成的。

英文摘要:

The 2006 outburst of GK Perseii differed significantly at optical and ultraviolet wavelengths from typical outbursts of this object. We present multi-wavelength (X-ray, UV and optical) Swift and AAVSO data, giving unprecedented broad-band coverage of the outburst, allowing us to follow the evolution of the longer-than-normal 2006 outburst across these wavelengths. In the optical and UV we see a triple-peaked morphology with maximum brightness ~1.5 magnitudes lower than in previous years. In contrast, the peak hard X-ray flux is the same as in previous outbursts. We resolve this dichotomy by demonstrating that the hard X-ray flux only accounts for a small fraction of the total energy liberated during accretion, and interpret the optical/UV outburst profile as arising from a series of heating and cooling waves traversing the disc, caused by its variable density profile.

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