The extra-galactic Cepheid distance scale from LMC and Galactic period-luminosity relations

Abstract

In this paper, we recalibrate the Cepheid distance to some nearby galaxies observed by the HST Key Project (KP) and the Sandage-Tammann-Saha (STS) group. We use much of the KP methodology in our analysis but apply new techniques, based on Fourier methods to estimate the mean magnitudes to published Cepheid data. We also apply different calibrating PL relations to estimate Cepheid distances, and investigate the sensitivity of the distance moduli to the adopted calibrating PL relation. We re-determine the OGLE LMC PL relations using a more conservative approach and also study the effect of using Galactic PL relations on the distance scale. For the KP galaxies, we find good agreement with an average discrepancy of -0.002 and 0.075mag. when using the LMC and Galaxy, respectively, as a calibrating PL relation. However, the Cepheid distance to STS galaxies are shorter by -0.178mag. and -0.108mag. on average again when using the LMC and Galaxy PL relations, respectively. We also calculate the distance to these galaxies using PL relations at maximum light and find very good agreement with mean light PL distances. However, after correcting for metallicity effects, the difference between the distance moduli obtained using the two sets of calibrating PL relations becomes negligible. This suggests that Cepheids in the LMC and Galaxy do follow different PL relations, at least at the median periods of the target galaxies.

arXiv comment21 pages, 14 tables, 9 figures, A&A accepted

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