Fig. 2.
Petersen diagrams (see text for explanations). Left panel: the entire Gaia DR2 sample of F/1O Cepheids (including those located in the Magellanic Clouds, 162 stars in total) is displayed over OGLE data for different classes of Cepheids pulsating in different modes. Previously known F/1O Cepheids in the Milky Way are shown as black crosses. Right panel: the bona fide Gaia DR2 sample of F/1O Cepheids (three stars) is displayed over OGLE data for different classes of Cepheids pulsating in different modes. Previously known F/1O Cepheids in the Milky Way are shown as black crosses.
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