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Paper: Type II Cepheids as Stellar Tracers and Distance Indicators
Volume: 529, RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators
Page: 259
Authors: Bhardwaj, A.; Braga, V. F.; Minniti, D.; Ramos, R. C.; Rejkuba, M.
Abstract: Type II Cepheids are both useful distance indicators and tracers of old age stellar populations in their host galaxy. We summarize near-infrared observations of type II Cepheids in the Large Magellanic Cloud and discuss the absolute calibration of their Period-Luminosity relations. Combining with the near-infrared data for type II Cepheids in the Galactic bulge from the VISTA VVV survey, we estimated a robust distance to the Galactic center. We found that type II Cepheids trace the spherically symmetric spatial distribution with a possible evidence of ellipsoidal structure, similar to RR Lyrae stars. Together with Gaia and VVV proper motions, type II Cepheids were found to trace the old, metal-poor, kinematically hot stellar populations in the Galactic bulge.
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