放大镜下的造父变星--毕竟没那么简单！
Cepheids under the magnifying glass -- not so simple, after all!
摘要：
经典造父变星是蓝圈星，被称为“恒星演化的放大镜“，并已被研究了很长一段时间。随着对造父变星的越来越精确的观测在不断增加的时间基线上得到保证，我们对这些关键恒星的物理学的无知变得越来越明显。因此，现在是时候把放大和调查的局限性，我们的理解经典criterators。当然，经典造父变星也是标准的烛光，这要归功于莱维特定律，它允许测量附近宇宙的距离。如今，造父变星是精确校准距离阶梯的支柱，可以测量哈勃常数（H 0）超过2%，从而为精确宇宙学提供关键约束。最近建立的不一致的H 0值测量在晚期宇宙和早期宇宙的观测推断，需要尽最大努力估计系统的不确定性，以加强结果的意义。在本次演讲中，我重点介绍了最近造父相关研究的两个主要方面。首先，我提出了日内瓦造父变星径向速度调查（GE-CeRVS）和更新的调制光谱变化表现出的4 D造父变星QZ Normae基于8年的监测。然后，我讨论了一些努力，对1%H0的测量需要理解的宇宙学意义的不和谐的H 0值。最后，我认为，现在是一个特别合适的时间来利用恒星物理学和观测宇宙学之间的协同作用。
英文摘要：
Classical Cepheids are blue loop stars that have famously been dubbed "magnifying glasses of stellar evolution" and have been studied for a long time. As more and more precise observations of Cepheids are secured over ever-increasing temporal baselines, our ignorance of the physics governing these crucial stars is becoming increasingly clear. Thus, it is time to turn up the magnification and investigate the limitations of our understanding of classical pulsators. Of course, classical Cepheids are also standard candles thanks to the Leavitt law that allows to measure distances in the nearby Universe. Nowadays, Cepheids serve as the backbone of a precisely calibrated distance ladder that allows to measure Hubble's constant (H0) to better than 2%, thus providing crucial constraints for precision cosmology. The recently established discord among H0 values measured in the late-time Universe and inferred from observations of the early Universe requires utmost diligence in estimating systematic uncertainties in order to strengthen the significance of the results. In this presentation I focus on two main aspects of recent Cepheid-related research. First, I present the Geneva Cepheid Radial Velocity survey (GE-CeRVS) and an update on the modulated spectroscopic variability exhibited by the 4 d Cepheid QZ Normae based on 8 years of monitoring. Then, I discuss some efforts directed towards a 1% H0 measurement needed for understanding the cosmological implications of discordant H0 values. Finally, I argue that now is a particularly opportune time to leverage the synergies between stellar physics and observational cosmology.
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