Oxygen isotopic ratios in RGB & AGB stars
Oxygen isotopic ratios in RGB & AGB stars
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RGB 中的氧同位素比率
DOI：
10.1088/1742-6596/703/1/012019
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Halabi G
中科院分区：
文献类型：
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作者：
Halabi G
质量范围在1.2- 7 M之间的恒星，具有类似太阳的初始成分，从零年龄主序星演化到AGB早期阶段。他们预测的氧同位素比值进行比较，在红巨星的观测推断值，以调查如何以及标准的进化计算再现现有的意见，并说明对流混合的作用。我们发现，额外的混合超出对流边界的史瓦西标准所确定的解释观测到的氧同位素比，特别是在低质量的恒星。最近的质子捕获反应的测定和它们的不确定性对16 O/17 O的影响也显示出来。
Stars in the mass range 1.2-7M⊙, with solar-like initial composition are evolved from the zero age main sequence till the early AGB phase. Their predicted oxygen isotopic ratios are compared to observationally inferred values in red giants to investigate how well standard evolutionary calculation reproduces available observations and to illustrate the role of convective mixing. We find that extra mixing beyond the convective boundary determined by the Schwarzschild criterion is needed to explain the observational oxygen isotopic ratios, particularly in low mass stars. The effect of recent determinations of proton capture reactions and their uncertainties on 16 O/17 O is also shown.