On the Use of Field RR Lyrae As Galactic Probes: IV. New Insights Into and Around the Oosterhoff Dichotomy

@article{Fabrizio2021OnTU,
  title={On the Use of Field RR Lyrae As Galactic Probes: IV. New Insights Into and Around the Oosterhoff Dichotomy},
  author={M. Fabrizio and Vittorio F. Braga and Juliana Crestani and Giuseppe Bono and I. Ferraro and Giuliana Fiorentino and G. Iannicola and Glenn W. Preston and Christopher Sneden and F. Th'evenin and G. Altavilla and Brian Chaboyer and M. Dall’ora and R. da Silva and E. K. Grebel and Christina K. Gilligan and H. Lala and Bertrand Lemasle and Davide Magurno and Massimo Marengo and S. Marinoni and P. M. Marrese and Clara E. Mart{\'i}nez-V{\'a}zquez and Noriyuki Matsunaga and Matteo Monelli and J. P. Mullen and Jillian R. Neeley and Mario Nonino and Z. Prudil and Maurizio Salaris and Peter B. Stetson and Elena Valenti and M. Zoccali},
  journal={The Astrophysical Journal},
  year={2021},
  volume={919}
}
We discuss the largest and most homogeneous spectroscopic data set of field RR Lyrae variables (RRLs) available to date. We estimated abundances using both high-resolution and low-resolution (ΔS method) spectra for fundamental (RRab) and first overtone (RRc) RRLs. The iron abundances for 7941 RRLs were supplemented with similar estimates that are available in the literature, ending up with 9015 RRLs (6150 RRab, 2865 RRc). The metallicity distribution shows a mean value of 〈[Fe/H]〉 = −1.51 ± 0… Expand

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