Reactive Flow in Nova Outbursts
Reactive Flow in Nova Outbursts
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DOI：
10.1086/303561
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发表时间：
1997-02
期刊：
影响因子：
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通讯作者：
S. A. Glasner;E. Livne;J. Truran
中科院分区：
文献类型：
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作者：
S. A. Glasner;E. Livne;J. Truran
本文用二维模拟方法研究了氢包层中的热核燃烧，其范围比最近提出的方法更广。讨论了热核逃逸（TNR）前和过程中对流燃烧过程的演化。我们研究了燃烧和流体动力学之间的耦合，这决定了对流的性质，并分析了相关的时间尺度。燃烧和核合成的后果进行了详细研究。燃烧过程由许多局部喷发组成，分散在整个氢包层（在其底部）。有几种机制以这种方式调节TNR发生在数百秒的时间间隔内的过程。这些机制是压力波、浮力和湍流扩散。TNR由包膜外层的近似球对称膨胀终止。对于一个1 M的核心，富集的氢信封对流过冲约为30%，与观测的新星。
Thermonuclear burning in hydrogen envelopes is studied using two-dimensional simulations, in a broader manner than that presented recently by Glasner & Livne. The evolution of the convective burning process before and during thermonuclear runaway (TNR) is discussed. We study the coupling between the burning and the hydrodynamics, which determines the nature of the convective flow, and analyze the relevant timescales. The consequences of the combustion and the nucleosynthesis are investigated in detail. The combustion process is composed of many local eruptions, scattered over the entire hydrogen envelope (at its base). Several mechanisms regulate the process in such a way that the TNR occurs over a time interval of several hundred seconds. These mechanisms are pressure waves, buoyancy, and turbulent diffusion. The TNR is terminated by a nearly spherically symmetric expansion of the outer layers of the envelope. For a 1 M☉ core, the enrichment of the hydrogen envelope by convective overshoot is approximately 30%, in agreement with observations of novae.