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arXiv 1607.03416astro-ph.HEastro-ph.SR
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X射线暴模型对核反应速率的依赖性

Dependence of X-Ray Burst Models on Nuclear Reaction Rates

R. H. Cyburt, A. M. Amthor, A. Heger, E. Johnson, L. Keek, Z. Meisel, H. Schatz, K. Smith

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24 pages, 13 figures, 4 tables, submitted
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摘要：

X射线爆发是发生在吸积中的中子星表面的热核闪光，需要可靠的爆发模型来解释中子星和双星系统的性质。我们调查的依赖性的X射线爆发模型的不确定性（p，$γ$），（$α$，$γ$），（$α$，p）核反应速率使用完全自洽的爆发模型，占之间的反馈变化核能产生和天体物理条件的变化。一个两步的方法首先确定敏感的核反应速率在一个单区模型与点火条件选择匹配的计算与最先进的一维多区模型的基础上{ \Kepler }恒星演化代码。所有相关的反应速率的中子缺乏同位素的质量106分别变化了100的因素向上和向下。然后在1D多区模型中重复计算84个最高冲击反应速率变化。我们发现一些不确定的反应速率，影响预测的光变曲线和爆裂灰烬显着。这些结果为我们深入了解影响X射线爆发观测值的核过程提供了依据，并为今后减少X射线爆发模型中的核不确定性提供了指导。

英文摘要：

X-ray bursts are thermonuclear flashes on the surface of accreting neutron stars and reliable burst models are needed to interpret observations in terms of properties of the neutron star and the binary system. We investigate the dependence of X-ray burst models on uncertainties in (p,$γ$), ($α$,$γ$), and ($α$,p) nuclear reaction rates using fully self-consistent burst models that account for the feedbacks between changes in nuclear energy generation and changes in astrophysical conditions. A two-step approach first identified sensitive nuclear reaction rates in a single-zone model with ignition conditions chosen to match calculations with a state-of-the-art 1D multi-zone model based on the {\Kepler} stellar evolution code. All relevant reaction rates on neutron deficient isotopes up to mass 106 were individually varied by a factor of 100 up and down. Calculations of the 84 highest impact reaction rate changes were then repeated in the 1D multi-zone model. We find a number of uncertain reaction rates that affect predictions of light curves and burst ashes significantly. The results provide insights into the nuclear processes that shape X-ray burst observables and guidance for future nuclear physics work to reduce nuclear uncertainties in X-ray burst models.

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