RS蛇夫座：热核爆炸还是椎间盘不稳定？
RS Ophiuchi: Thermonuclear Explosion or Disc Instability?
摘要：
Sokoloski等人（2008年）最近报告了证据表明，周期性新星蛇夫座RS在2006年爆发后的几天内产生了一对高度准直的射电喷流。这表明在爆发期间必须存在一个吸积盘。然而，在标准的热核事件中，任何这样的盘都必须从白矮星附近被驱逐出去，因为核能的产量大大超过了它的结合能。相反，我们建议的RS Oph的爆发是热粘性不稳定性的中心吸积白矮星照射盘。RS Oph的显著特征是其吸积盘非常大。有鉴于此，它自然符合具有不稳定吸积盘的系统的一致图像。这张照片解释了喷流的存在和速度，爆发的亮度和持续时间，它的上升时间和线性衰减，以及平静的模糊。相比之下，迄今为止关于反复发生的热核爆炸的标准图景有许多严重的困难。这些包括喷流的存在，静止的模糊，以及吸积盘必须是不稳定的，除非它远小于任何合理的估计。
英文摘要：
Sokoloski et al (2008) have recently reported evidence that the recurrent nova RS Ophiuchi produced a pair of highly collimated radio jets within days of its 2006 outburst. This suggests that an accretion disc must be present during the outburst. However in the standard picture of recurrent novae as thermonuclear events, any such disc must be expelled from the white dwarf vicinity, as the nuclear energy yield greatly exceeds its binding energy. We suggest instead that the outbursts of RS Oph are thermal--viscous instabilities in a disc irradiated by the central accreting white dwarf. The distinctive feature of RS Oph is the very large size of its accretion disc. Given this, it fits naturally into a consistent picture of systems with unstable accretion discs. This picture explains the presence and speed of the jets, the brightness and duration of the outburst, and its rise time and linear decay, as well as the faintness of the quiescence. By contrast, the hitherto standard picture of recurrent thermonuclear explosions has a number of severe difficulties. These include the presence of jets, the faintness of quiescence, and the fact the the accretion disc must be unstable unless it is far smaller than any reasonable estimate.
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