The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XIII. The Metallicity Dependence of the Cepheid Distance Scale

@article{Kennicutt1997TheHS,
  title={The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XIII. The Metallicity Dependence of the Cepheid Distance Scale},
  author={Robert Charles Kennicutt and Peter B. Stetson and A. Saha and Daniel D Kelson and Daya M. Rawson and Shoko Sakai and Barry F. Madore and Jeremy Mould and Wendy L. Freedman and Fabio Bresolin and Laura Ferrarese and Holland Cole Ford and Brad K. Gibson and James R. Graham and M. Han and Paul Harding and John G. Hoessel and John Peter Huchra and Shaun M. G. Hughes and Garth D. Illingworth and Lucas M. Macri and Randy L. Phelps and Nancy Ann Silbermann and Anne Marie Turner and Peter Wood},
  journal={The Astrophysical Journal},
  year={1997},
  volume={498},
  pages={181-194}
}
Uncertainty in the metal-abundance dependence of the Cepheid variable period-luminosity (PL) relation remains one of the outstanding sources of systematic error in the extragalactic distance scale and in the Hubble constant. To test for such a metallicity dependence, we have used the Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space Telescope (HST) to observe Cepheids that span a range in oxygen abundance of 0.7 ± 0.15 dex in two fields in the nearby spiral galaxy M101. A differential… 
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