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Mixing up isotopes in evolved stars
Science ( IF 56.9 ) Pub Date : 2017-04-13 , DOI: 10.1126/science.356.6334.150-e
Keith T. Smith

Stellar Astrophysics The elements carbon, nitrogen, and oxygen (CNO) are involved in nuclear fusion reactions in the cores of stars, which affect the relative abundances of their isotopes. As a star ages, changing conditions can cause convection to bring material from the core to the surface, modifying the isotope ratios that are visible to astronomers. Abai et al. measured CNO isotope ratios in a sample of evolved objects known as asymptotic giant branch (AGB) stars and compared them with stellar evolution simulations. The observed oxygen isotope ratios are similar to those found in some grains present in meteorites; perhaps those grains originally formed in material ejected from AGB stars. Astron. Astrophys. 599 , A39 (2017).

中文翻译:

混合进化恒星中的同位素

恒星天体物理学 碳、氮和氧 (CNO) 元素参与了恒星核心的核聚变反应,这会影响其同位素的相对丰度。随着恒星老化,不断变化的条件会导致对流将物质从核心带到表面,从而改变天文学家可见的同位素比率。阿拜等人。测量了称为渐近巨星分支 (AGB) 恒星的演化天体样本中的 CNO 同位素比率,并将它们与恒星演化模拟进行了比较。观察到的氧同位素比率与在陨石中的一些颗粒中发现的相似;也许这些颗粒最初是在 AGB 恒星喷出的物质中形成的。天文。天体。599,A39(2017)。
更新日期:2017-04-13
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