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Revisiting the fundamental properties of the Cepheid Polaris using detailed stellar evolution models

机译:使用详细的恒星演化模型重新研究造父变星北极星的基本特性

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Polaris the Cepheid has been observed for centuries, presenting surprises and changing our view of Cepheids and stellar astrophysics, in general. Specifically, understanding Polaris helps anchor the Cepheid Leavitt law, but the distance must be measured precisely. The recent debate regarding the distance to Polaris has raised questions about its role in calibrating the Leavitt law and even its evolutionary status. In this work, I present new stellar evolution models of Cepheids to compare with previously measured CNO abundances, period change and angular diameter. Based on the comparison, I show that Polaris cannot be evolving along the first crossing of the Cepheid instability strip and cannot have evolved from a rapidly-rotating main sequence star. As such, Polaris must also be at least 118 pc away and pulsates in the first overtone, disagreeing with the recent results of Turner et al. (2013, ApJ, 762, L8).
机译:造父变星北极星已有数百年的历史,它给人以惊喜,并改变了我们对造父变星和恒星天体物理学的看法。具体来说,了解北极星有助于锚定造父变星利维特定律,但距离必须精确测量。最近有关到北极星距离的争论提出了有关它在校准Leavitt定律中的作用甚至其进化状态的疑问。在这项工作中,我提出了造父变星的新恒星演化模型,以与先前测得的CNO丰度,周期变化和角直径进行比较。根据比较,我表明北极星不能沿着造父变星不稳定带的第一次穿越演化,也不能从快速旋转的主序星演化而来。因此,北极星也必须相距至少118 pc,并在第一个泛音中脉动,这与Turner等人的最新结果不一致。 (2013,ApJ,762,L8)。

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