论文标题
白色矮人的初始质量关系：校准第三条挖掘的工具
The Initial-Final Mass Relation of White Dwarfs: A Tool to Calibrate the Third Dredge-up
论文作者
论文摘要
白色矮人（WD）的初始质量质量关系（IFMR）代表了恒星进化模型的关键基准，尤其是在渐近巨型分支（AGB）期间混合发作和质量损失的效率。在这项研究中，我们认为这种关系提供了限制第三次挖掘（3DU）的机会，对化学产量产生了重要影响。根据最近的研究，讨论了结果，这些研究已经确定了IFMR中的扭结，对于接近$ 2 \，m _ {\ odot} $的初始质量。采用一种身体上的方法，其中3DU的效率$λ$随着核心和信封质量而变化，我们在太阳能中校准了$λ$ TP-AGB模型，以便在初始质量$ 0.9 \ le m _}}范围内重现其WD期间的最终质量6 $。特别是，我们发现，在低质量星星中，$ 1.4 \ le m _ {\ rm i}/m _ {\ odot} \ le 2.0 $效率很小，$λ\ le 0.3 $，它急剧上升至$λ\ simeq 0.65 $ simeq 0.65 $ in Intermediate-mass in Intermediate-Mass in Intermediate-Mass，$ 2.0 \ 2.0 \ le M _ { i}/m _ {\ odot} \ le 4.0 $，然后它以$ 4.0 \ le m _ {\ rm i}/m _ {\ odot} \ le 6.0 $ 6.0 $下降到大型TP-AGB星星中。我们的研究还表明，在最大的碳恒星与由热底燃烧主导的碳恒星之间的过渡时，第二个扭结可能出现在IFMR中。
The initial mass-final mass relationship (IFMR) of white dwarfs (WD) represents a crucial benchmark for stellar evolution models, especially for the efficiency of mixing episodes and mass loss during the asymptotic giant branch (AGB) phase. In this study, we argue that such relation offers the opportunity of constraining the third dredge-up (3DU), with important consequences for chemical yields. The results are discussed in light of recent studies that have identified a kink in the IFMR for initial masses close to $2\,M_{\odot}$. Adopting a physically-sound approach in which the efficiency $λ$ of the 3DU varies as a function of core and envelope masses, we calibrate $λ$ in solar-metallicity TP-AGB models in order to reproduce the final masses of their WD progeny, over a the range of initial masses $0.9 \le M_{\rm i}/M_{\odot} \le 6$. In particular, we find that in low-mass stars with $1.4 \le M_{\rm i}/M_{\odot} \le 2.0$ the efficiency is small, $λ\le 0.3$, it steeply rises to about $λ\simeq 0.65$ in intermediate-mass stars with $2.0 \le M_{\rm i}/M_{\odot} \le 4.0$, and then it drops in massive TP-AGB stars with $4.0 \le M_{\rm i}/M_{\odot} \le 6.0$. Our study also suggests that a second kink may show up in the IFMR at the transition between the most massive carbon stars and those that are dominated by hot-bottom burning.
