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首页> 外文期刊>The Astrophysical journal >BEAT CEPHEIDS AS PROBES OF STELLAR AND GALACTIC METALLICITY
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BEAT CEPHEIDS AS PROBES OF STELLAR AND GALACTIC METALLICITY

机译：球状晶体作为恒星和银河金属的问题

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摘要

The mere location of a beat Cepheid model in a period ratio versus period diagram (Petersen diagram) puts very tight constraints on its metallicity Z. The beat Cepheid Petersen diagrams are revisited with linear nonadiabatic turbulent convective models, and their accuracy as a probe for stellar metallicity is evaluated. They are shown to be largely independent of the helium content Y, and they are also only weakly dependent on the mass-luminosity relation that is used in their construction. However, they are found to show sensitivity to the relative abundances of the elements that are lumped into the metallicity parameter Z. Rotation is estimated to have but a small effect on the "pulsation metallicities." A composite Petersen diagram is presented that allows one to read off upper and lower limits on the metallicity Z from the measured period P_0 and period ratio P_(10).
机译：节拍造父变星模型在周期比与周期图（彼得森图）中的唯一位置对其金属度Z施加了非常严格的约束。节拍造父变星Petersen图通过线性非绝热湍流对流模型进行了重新研究，其精度可作为恒星探测的基础评估金属性。它们显示出很大程度上与氦含量Y无关，并且它们也仅微弱地依赖于其构造中使用的质量-光度关系。但是，发现它们对集中到金属度参数Z中的元素的相对丰度表现出敏感性。估计旋转对“脉冲金属度”的影响很小。提出了一个合成的彼得森图，该图允许人们从测量的周期P_0和周期比P_（10）读取金属性Z的上限和下限。

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