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Paper: Metallicity Distribution of Galactic Halo Field RR Lyræ, and the Effect of Metallicity on Their Pulsation Properties
Volume: 529, RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators
Page: 139
Authors: Marengo, M.; Mullen, J.; Neeley, J. R.; Fabrizio, M.; Marrese, P. M.; Bono, G.; Braga, V. F.; Magurno, D.; Crestani, J.; Fiorentino, G.; Monelli, M.; Chaboyer, B.; Gilligan, C. K.; Dall'Ora, M.; Martínez-Vázquez, C. E.; Thévenin, F.; Matsunaga, N.
Abstract: We present our analysis of a large sample (over 150k) of candidate Galactic RR Lyrae (RRL) stars for which we derived high quality photometry at UV, optical and infrared wavelengths, using data from publicly available surveys. For a sub-sample of these stars (∼ 2,400 fundamental mode field RRLs) we have measured their individual metallicity using the ΔS method, resulting in the largest and most homogeneous spectroscopic data set collected for RRLs. We use this sample to study the metallicity distribution in the Galactic Halo, including the long-standing problem of the Oosterhoff dichotomy among Galactic globular clusters. We also analyze the dependence of their pulsation properties, and in particular the shape of their infrared light curves, from their [Fe/H] abundance.
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