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Paper: Omega Centauri: a Laboratory for All RR Lyrae
Volume: 529, RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators
Page: 172
Authors: Braga, V. F.; Bono, G.; Stetson, P. B.; Dall'Ora, M.; Marconi, M.; Fabrizio, M.; Marinoni, S.; Marrese, P. M.; Marengo, M.; Neeley, J.; Ferraro, I.; Fiorentino, G.; Iannicola, G.
Abstract: We have collected thousands of optical (UBVRI) and Near-Infrared (JHKs) images of ω Cen and derived the pulsation properties of its RR Lyrae. We found a clear difference between their period distribution and that of RRLs in dwarf Spheroidal galaxies. We also detected a peculiar behavior of their optical-to-NIR amplitude ratios, similar to the behavior of Classical Cepheids. By adopting the Period-Luminosity relations of RRLs, we estimated the distance modulus of the cluster, which is crucial for the calibration of the extragalactic distance scale. Finally, we used the light curves of the RRLs of ω Cen, M4 and a dozen of field RRLs, to build new NIR light curve templates. We adopted these templates to estimate mean magnitudes of ∼1000 field RRLs for which we have retrieved multiepoch 2MASS photometry.
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