The Araucaria Project: A Wide-Field Photometric Survey for Cepheid Variables in NGC 3109

  title={The Araucaria Project: A Wide-Field Photometric Survey for Cepheid Variables in NGC 3109},
  author={Grzegorz Pietrzyński and Wolfgang Gieren and Andrzej Udalski and Igor Soszyński and Fabio Bresolin and Rolf Peter Kudritzki and Ronald Mennickent and Michał K. Szymański},
  journal={The Astrophysical Journal},
We have obtained mosaic images of NGC 3109 in the V and I bands on 74 nights, spanning approximately 1 yr. From these data, we have conducted an extensive search for Cepheid variables over the entire field of the galaxy, resulting in the discovery of 113 variables with periods ranging from 3.4 to 31.4 days. In this sample, 76 Cepheids, including many long-period variables, were not known before. For the previously known 45 Cepheids in this galaxy, our data proved that reported periods were… 

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