Novae Contribution to the Galactic Lithium Enhancement

Novae Contribution to the Galactic Lithium Enhancement
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新星对银河锂增强的贡献

DOI:
10.1088/1538-3873/aa6b4d
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发表时间:
2017-05
影响因子:
3.5
通讯作者:
Zhu Chunhua
Zhu Chunhua
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Rukeya Rejiefu;Lu Guoliang;Wang Zhaojun;Zhu Chunhua

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我们使用MESA(恒星天体物理实验模块)代码计算了发生在碳-氧(CO)和氧-氖-镁(ONeMg)白矮星(WDs)表面的经典新星喷出物中7li的产率。本文以WDs的质量和质量吸积率为输入参数,给出了经典新星7 Li产率的网格图,共包含79个模型。在相似的输入参数下,我们模型中的7锂产率与文献中已有的结果一致。然后将最近从经典新星V1369半人马座中推断出的Li产率与本工作中获得的理论值进行了比较。本文以网格为基础,以种群合成为方法,估计了经典新星产生的7li与银河系总7li的比值。我们的模拟表明,新星每年可以喷射出7 Li的10−9 M⊙。因此,我们可以估计银河系中大约10%的7li来自经典新星,这明显高于渐近巨星分支星产生的7li。
We use the Modules for Experiments in Stellar Astrophysics (MESA) code to calculate the yields of 7 Li in the ejecta of classical novae, occurring on the surface of carbon-oxygen (CO) and oxygen-neon-magnesium (ONeMg) white dwarfs (WDs). Taking the masses and the mass accretion rates of WDs as input parameters, this article presents a grid showing the yield of 7 Li from classical novae, including a total of 79 models. Under similar input parameters, the 7 Li yields in our models are consistent with previous ones in the literature. 7 Li yields recently inferred spectroscopically from classical nova V1369 Cen are then compared with the theoretical values obtained in this work. Using the grid as its basis and population synthesis as its method, this paper estimates the amount of 7 Li produced by classical novae compared to the total 7 Li in the Galaxy. Our simulations suggest that novae can eject about 10 − 9 M ⊙ of 7 Li every year. Hence, one may estimate that approximately 10% of 7 Li in the Galaxy originates from classical novae, which is significantly higher than the 7 Li produced by asymptotic giant branch stars.
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