On the evidence of extra mixing in models of 8M_⊙ computed with the new solar abundances
On the evidence of extra mixing in models of 8M_⊙ computed with the new solar abundances
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关于用新的太阳丰度计算的 8M_⊙ 模型中额外混合的证据
DOI：
10.1051/epjconf/20134301008
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发表时间：
2013
影响因子：
--
通讯作者：
R.
中科院分区：
文献类型：
--
作者：
Godart;M.;Noels;A. & Scuflaire;R.
已知质量大于 3M 的恒星在其核心氦燃烧阶段会在 HR 图上出现循环。除了非常大的恒星之外，它们的环的范围随着恒星质量的增加而增加。我们表明，用新的太阳丰度计算的 8M⊙ 恒星的恒星演化轨迹 [2] 仅显示出位于红巨星分支附近的一个非常小的环。需要超出对流包络线以下才能获得位于 μ 梯度区域足够深的 H 不连续性，从而允许在 HR 图中形成环。
Stars more massive than about 3M⊙are known to experience loops in the HR diagram during their core helium burning phase. Except for very massive stars the extent of their loops increases with the stellar mass. We show that a stellar evolution track for a 8M⊙star computed with the new solar abundances [2] shows only a very tiny loop located near the red giant branch. An overshooting below the convective envelope is required to obtain a H-discontinuity located deep enough in the μ-gradient region and thus to allow the development of a loop in the HR diagram.