经典新星V339 Del的爆炸性锂生产（Nova Delphini 2013）
Explosive lithium production in the classical nova V339 Del (Nova Delphini 2013)
摘要：
锂的起源和产生过程一直是宇宙学和天体物理学中悬而未决的问题。锂产生事件或地点的候选环境包括大爆炸核合成、高能宇宙射线与星际物质的相互作用、演化的低质量恒星、新星和超新星爆炸。化学演化模型和观测到的恒星锂丰度表明，目前锂丰度的至少一半可能是在红巨星，渐近巨星分支（AGB）恒星和新星中产生的。然而，没有直接的证据，从恒星物体的锂供应到银河系medium.Here，我们报告的单电离放射性同位素铍，$^{7}$ Be，在经典新星V339 Del（Nova Delphini 2013）的近紫外（UV）光谱的检测高蓝移共振线。光谱是在爆炸后38至48天获得的。$^{7}$ Be在短时间内衰变形成$^{7}$ Li（半衰期53.22天）。光谱检测到这种脆弱的同位素意味着它是在新星爆炸过程中通过反应$^{3}\mbox{He}(α,γ)^{7}\mbox{Be}$产生的，并支持了理论预测，即在经典的新星爆炸中可以产生大量的$^{7}$ Li。这一发现为探索经典新星中$^{7}$ Li的产生开辟了一条新的途径，并为锂的星系演化之谜提供了线索。
英文摘要：
The origin of lithium (Li) and its production process have long been an unsettled question in cosmology and astrophysics. Candidates environments of Li production events or sites suggested by previous studies include big bang nucleosynthesis, interactions of energetic cosmic rays with interstellar matter, evolved low mass stars, novae, and supernova explosions. Chemical evolution models and observed stellar Li abundances suggest that at least half of the present Li abundance may have been produced in red giants, asymptotic giant branch (AGB) stars, and novae. However, no direct evidence for the supply of Li from stellar objects to the Galactic medium has yet been found. Here we report on the detection of highly blue-shifted resonance lines of the singly ionized radioactive isotope of beryllium, $^{7}$Be, in the near ultraviolet (UV) spectra of the classical nova V339 Del (Nova Delphini 2013). Spectra were obtained 38 to 48 days after the explosion. $^{7}$Be decays to form $^{7}$Li within a short time (half-life 53.22 days). The spectroscopic detection of this fragile isotope implies that it has been created during the nova explosion via the reaction $^{3}\mbox{He}(α,γ)^{7}\mbox{Be}$, and supports the theoretical prediction that a significant amount of $^{7}$Li could be produced in classical nova explosions. This finding opens a new way to explore $^{7}$Li production in classical novae and provides a clue to the mystery of the Galactic evolution of lithium.
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