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arXiv 0704.2549astro-ph
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2006年蛇夫座周期性新星RS爆发的快速观测:II。风激冲击的一维流体动力学模型

Swift observations of the 2006 outburst of the recurrent nova RS Ophiuchi: II. 1D hydrodynamical models of wind driven shocks

N. M. H. Vaytet, T. J. O'Brien, M. F. Bode

摘要:

继2006年2月(论文I)的经常性新星RS Ophiuchi的最新爆发的早期斯威夫特X射线观测,我们提出了新的一维流体动力学模型的系统,考虑到所有三个阶段的残留物的演变。该模型提出了一种新的方法来模拟系统的突然增加,然后减少风的质量损失率和速度的爆发。这种风模型和以前的Primakoff型模拟之间的差异进行了说明。一个更复杂的结构,即使在一维,揭示了通过存在的向前和反向冲击,与分离接触不连续性。辐射冷却的影响进行了研究和关键的爆发参数,如质量损失率,喷出物的速度和质量的变化。作为时间函数的激波速度与文献I中导出的激波速度进行了比较。我们展示了物质被喷射的方式如何控制冲击波的演化,对于冷却良好的残骸,冲击波的减速率取决于辐射出去的能量。

英文摘要:

Following the early Swift X-ray observations of the latest outburst of the recurrent nova RS Ophiuchi in February 2006 (Paper I), we present new 1D hydrodynamical models of the system which take into account all three phases of the remnant evolution. The models suggest a novel way of modelling the system by treating the outburst as a sudden increase then decrease in wind mass-loss rate and velocity. The differences between this wind model and previous Primakoff-type simulations are described. A more complex structure, even in 1D, is revealed through the presence of both forward and reverse shocks, with a separating contact discontinuity. The effects of radiative cooling are investigated and key outburst parameters such as mass-loss rate, ejecta velocity and mass are varied. The shock velocities as a function of time are compared to the ones derived in Paper I. We show how the manner in which the matter is ejected controls the evolution of the shock and that for a well-cooled remnant, the shock deceleration rate depends on the amount of energy that is radiated away.

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