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Paper: Three-Dimensional Distributions of Type II and Anomalous Cepheids in the Magellanic Clouds Unravel the Origin of These Stars
Volume: 529, RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators
Page: 17
Authors: Iwanek, P.; Team OGLE
Abstract: The spatial distributions of stars in galaxies may shed light on their possible evolutionary channels. While the nature of type II and anomalous Cepheids is still under discussion, their three-dimensional distributions could bring us closer to solving the mysteries of their origins. We use the nearly complete collection of classical pulsating stars discovered by the OGLE project in the Magellanic Clouds to compare spatial distributions of type II and anomalous Cepheids with well-understood classical Cepheids and RR Lyr stars. We show that BL Her stars are as old as RR Lyr stars, while W Vir variables could be a mixture of old and intermediate-age stars. Our analysis confirms anomalous Cepheids evolution scenario that assumes they are products of coalescence of binary systems.
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