Rotation and the Cepheid Mass Discrepancy

Anderson, Richard I. ; Ekström, Sylvia ; Georgy, Cyril ; Meynet, Georges ; Mowlavi, Nami ; Eyer, Laurent

In: Proceedings of the International Astronomical Union, 2014, vol. 9, no. S307, p. 206-207

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    We recently showed that rotation significantly affects most observable Cepheid quantities, and that rotation, in combination with the evolutionary status of the star, can resolve the long-standing Cepheid mass discrepancy problem. We therefore provide a brief overview of our results regarding the problem of Cepheid masses. We also briefly mention the impact of rotation on the Cepheid period-luminosity(-color) relation, which is crucial for determining extragalactic distances, and thus for calibrating the Hubble constant