... Sakai et al. (2000) presented the calibration of the TF relation based on Cepheid distances to 21 galaxies within 25 Mpc and 23 clusters within 10 000 km/s. Results: intrinsic dispersion 0.m 2, slopes (B ) = 3.2, (V ) = 3.5, (R ) = 3.5, (I ) = 3.7, (H ...
... This hypothesis is partially supported by a higher fraction of metal-rich Cepheids found at these galactic longitudes (see Fig. 5 in Pedicelli et al. ...