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首页> 外文期刊>The Astrophysical journal >THE IMPACT OF POLLUTION ON STELLAR EVOLUTION MODELS
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THE IMPACT OF POLLUTION ON STELLAR EVOLUTION MODELS

机译:污染对恒星演化模型的影响

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An approach is introduced for incorporating the concept of stellar pollution into stellar evolution models. The approach involves enhancing the metal content of the surface layers of stellar models. In addition, the surface layers of stars in the mass range of 0.5-2.0 solar mass are mixed to an artificial depth motivated by observations of lithium abundance. The behavior of polluted stellar evolution models is explored assuming the pollution occurs after the star has left the fully convective pre-main-sequence phase. Stellar models polluted with a few Earth masses (M_⊕) of iron are significantly hotter than stars of the same mass with an equivalent bulk metallicity. Polluted stellar evolution models can successfully reproduce the metal-rich, parent star τ Bootis and suggest a slightly lower mass than standard evolution models. Finally, the possibility that stars in the Hyades open cluster have accreted an average of 0.5 M_⊕ of iron is explored. The results indicate that it is not possible to rule out stellar pollution on this scale from the scatter of Hyades stars on a color-magnitude diagram. The small amount of scatter in the observational data set does rule out pollution on the order of ~1.5 M_⊕ of iron. Pollution effects at the low level of 0.5 M_⊕ of iron do not produce substantial changes in a star's evolution.
机译:介绍了一种将恒星污染概念纳入恒星演化模型的方法。该方法涉及提高恒星模型表层的金属含量。另外,将质量范围为0.5-2.0太阳质量的恒星的表层混合到由观察到的锂丰度引起的人工深度。假设污染是在恒星离开完全对流的主序前阶段之后发生的,则探索了受污染的恒星演化模型的行为。受到少量地球铁(M_⊕)污染的恒星模型比具有相同质量的具有相同体积金属的恒星要热得多。受污染的恒星演化模型可以成功地复制出富含金属的母星τBootis,并且其质量比标准演化模型要低。最后,探讨了Hyades疏散星团中恒星平均吸收0.5M_⊕铁的可能性。结果表明,不可能从色度图上的Hyades恒星的散射中排除这种规模的恒星污染。观测数据集中的少量散布确实排除了约1.5M_⊕铁的污染。铁含量低至0.5M_⊕时的污染效应不会在恒星的演化中产生实质性变化。

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