A homogeneous sample of 2,903 field RR Lyrae stars shows a continuous period-metallicity relation, indicating the Oosterhoff dichotomy in globular clusters stems from the lack of metal-intermediate clusters rather than an intrinsic pulsation difference.
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On the use of field RR Lyrae as Galactic probes: I. The Oosterhoff dichotomy based on fundamental variables
A homogeneous sample of 2,903 field RR Lyrae stars shows a continuous period-metallicity relation, indicating the Oosterhoff dichotomy in globular clusters stems from the lack of metal-intermediate clusters rather than an intrinsic pulsation difference.