Gaia Data Release 1
Free Access

Fig. 7


Petersen diagram of double-mode RR Lyrae stars observed by the OGLE and ASAS surveys in the LMC (red filled circles), SMC (blue filled circles), and in the Galactic bulge (green filled circles) and halo (yellow filled circles). PF and P1O are the fundamental and first overtone pulsation mode, respectively (see text for details).

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