The Discovery of Cepheids and a Distance to NGC 5128

@article{Ferrarese2007TheDO,
  title={The Discovery of Cepheids and a Distance to NGC 5128},
  author={Laura Ferrarese and Jeremy R. Mould and Peter B. Stetson and John L. Tonry and John P. Blakeslee and Edward A. Ajhar},
  journal={The Astrophysical Journal},
  year={2007},
  volume={654},
  pages={186 - 218}
}
We discuss a new distance to NGC 5128 (Centaurus A) based on Cepheid variables observed with the Hubble Space Telescope. Twelve F555W (V) and six F814W (I) epochs of cosmic-ray-split WFPC2 observations were obtained. A total of 56 bona fide Cepheids were discovered, with periods ranging from 5 to ~50 days; five of these are likely Population II Cepheids of the W Virginis class, associated with the bulge or halo of NGC 5128. Based on the period and V- and I-band luminosities of a subsample of 42… 

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