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Fig. 1


Wesenheit PL relation. Stars in the SMC are plotted in red and shifted to the distance of the LMC. Some outliers are indicated with their identifier. Stars with an IR excess according to GJ17 are indicated by a green plus sign. Stars that show eclipsing or ellipsoidal variations according to OGLE are indicated by a blue cross. Stars plotted as a blue diamond are OGLE-LMC-CEP-0227 (the classical Cepheid in an eclipsing binary system, at P = 3.79 days) and the Galactic T2C κ Pav (at P = 9.08 days) scaled to the distance of the LMC (see text). For − 0227 both the system value (the smaller, brighter point) and the Wesenheit magnitude of the Cepheid in the system (from Pilecki et al. 2013) are plotted. The black solid line shows the relation derived from the BLH + WVIR + non-dusty RVTs with periods below 50 days in the LMC (see Table 1), plotted over the entire period range. The blue lines indicate the Wesenheit relation for CC in the LMC from Soszyński et al. (2008a) for FU (solid line) and FU (dashed line) pulsators and the relation for RRab stars (at log P< −0.08) from Soszynski et al. (2003).

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