Very massive star winds as sources of the short-lived radioactive isotope 26 Al
Very massive star winds as sources of the short-lived radioactive isotope 26 Al
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非常巨大的星风是短命放射性同位素 26 Al 的来源
DOI：
10.1051/0004-6361/202243474
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发表时间：
2022
影响因子：
6.5
通讯作者：
Martinet S
中科院分区：
文献类型：
--
作者：
Martinet S
背景26Al 短寿命放射性核素是观测到的 1.8 MeV 银河漫射 γ 射线发射的来源。虽然26Al的不同来源已经被探索过，如渐近巨分支星、大质量恒星风和超新星，但迄今为止，超大质量恒星的贡献尚未被研究。目的我们研究超大质量恒星（这里是初始质量在150到300M⊙之间的恒星）的星风对银河星际介质26Al富集的贡献。方法我们通过研究旋转和非旋转来研究26Al的产生初始质量在 150 到 300M 之间的超大质量恒星模型，金属量 Z= 0.006、0.014 和 0.020。我们将这一结果与简单的银河系模型进行了比较，并考虑了金属丰度和恒星形成速率梯度。结果我们得出，Z= 0.006 − 0.020金属丰度范围内的超大质量恒星可能对星际介质26Al富集有非常重要的贡献。通常，当考虑非常大质量的恒星时，大质量恒星风对银河系 26 Al 总量的贡献会增加 150%。结论 尽管非常罕见，但非常大质量的恒星可能是 26 Al 的重要贡献者，并且总体上可能是银河系中核合成的非常重要的参与者。
ContextThe26Al short-lived radioactive nuclide is the source of the observed galactic diffuseγ-ray emission at 1.8 MeV. While different sources of26Al have been explored, such as asymptotic giant branch stars, massive stellar winds, and supernovae, the contribution of very massive stars has not been studied so far.AimsWe study the contribution of the stellar wind of very massive stars, here, stars with initial masses between 150 and 300M⊙, to the enrichment in26Al of the galactic interstellar medium.MethodsWe studied the production of26Al by studying rotating and non-rotating very massive stellar models with initial masses between 150 and 300M⊙for metallicitiesZ= 0.006, 0.014, and 0.020. We compared this result to a simple Milky Way model and took the metallicity and the star formation rate gradients into account.ResultsWe obtain that very massive stars in theZ= 0.006 − 0.020 metallicity range might be very significant contributors to the26Al enrichment of the interstellar medium. Typically, the contribution of the winds of massive stars to the total quantity of26Al in the Galaxy increases by 150% when very massive stars are considered.ConclusionsDespite their rarity, very massive stars might be important contributors to26Al and might overall be very important actors for nucleosynthesis in the Galaxy.