作为恒星和银河系金属丰度探测器的Beat造父变星：新的AGS丰度
Beat Cepheids as Probes of Stellar and Galactic Metallicity: The New AGS Abundances
摘要：
众所周知，拍造父变星模型在周期比\vs周期图（Petersen图）中的位置限制了它的金属丰度Z。但是这些界限对集中到参数$Z$中的元素的混合是敏感的。在这篇简短的论文中，我们更新了以前的结果，是基于Grevesse-Noels太阳混合最近，修订的Asplund，Grevesse & Sauval（2005）（AGS）太阳混合。我们还研究了包络深度对计算脉动周期的准确性的影响。我们发现，低周期造父变星与高Z的包络脉动的习惯近似打破。这是必要的计算恒星模型，延伸到中心，并包括燃烧和成分不均匀性的建模。然而幸运的是，迄今为止观察到的大多数Beat造父变星似乎都避开了这种机制。
英文摘要：
It is well known that the mere location of a Beat Cepheid model in a Period Ratio \vs Period diagram (Petersen diagram) puts constraints on its metallicity Z. But these bounds are sensitive to the mixture of elements that are lumped into the parameter $Z$. In this short paper we update the previous results that were based on the Grevesse-Noels solar mixture to the recent, revised Asplund, Grevesse & Sauval (2005) (AGS) solar mixture. We also examine the effect of the envelope depth on the accuracy of the computed pulsation periods. We find that for low period Cepheids with high Z the customary approximation of envelope pulsation breaks down. It is necessary to compute stellar models that extend to the center and to include burning and composition inhomogeneities in the modeling. Fortunately, however, most Beat Cepheids that have been observed so far seem to avoid that regime.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
