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首页> 外文期刊>The Astrophysical journal >MESA MODELS OF CLASSICAL NOVA OUTBURSTS: THE MULTICYCLE EVOLUTION AND EFFECTS OF CONVECTIVE BOUNDARY MIXING
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MESA MODELS OF CLASSICAL NOVA OUTBURSTS: THE MULTICYCLE EVOLUTION AND EFFECTS OF CONVECTIVE BOUNDARY MIXING

机译:新星爆发的MESA模型:对流边界混合的多周期演化和影响

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Novae are cataclysmic variables driven by accretion of H-rich material onto a white dwarf (WD) star from its low-mass main-sequence binary companion. New time-domain observational capabilities, such as the Palomar Transient Factory and Pan-STARRS, have revealed a diversity of their behavior that should be theoretically addressed. Nova outbursts depend sensitively on nuclear physics data, and more readily available nova simulations are needed in order to effectively prioritize experimental effort in nuclear astrophysics. In this paper, we use the MESA stellar evolution code to construct multicycle nova evolution sequences with CO WD cores. We explore a range of WD masses and accretion rates as well as the effect of different cooling times before the onset of accretion. In addition, we study the dependence on the elemental abundance distribution of accreted material and convective boundary mixing at the core-envelope interface. Models with such convective boundary mixing display an enrichment of the accreted envelope with C and O from the underlying WD that is commensurate with observations. We compare our results with the previous work and investigate a new scenario for novae with the 3He-triggered convection.
机译:Novae是由低质量主序列双星伴星将富氢物质吸积到白矮星(WD)上而引起的大变变数。诸如Palomar Transient Factory和Pan-STARRS等新的时域观测功能已经揭示了其行为的多样性,应在理论上加以解决。新星爆发很敏感地取决于核物理数据,因此需要更容易获得的新星模拟才能有效地优先进行核天体物理学的实验工作。在本文中,我们使用MESA恒星演化代码构建带有CO WD核的多周期新星演化序列。我们探索了WD质量和吸积率的范围以及吸积开始之前不同冷却时间的影响。此外,我们研究了芯体-包壳界面对吸积物质元素丰度分布和对流边界混合的依赖性。具有这种对流边界混合的模型显示,与观测值相对应的是,来自底层WD的C和O丰富了包涵层。我们将我们的结果与以前的工作进行了比较,并通过3He触发对流研究了新星的新情况。

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