Fig. 6 from The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXII. The Discovery of Cepheids in NGC 1326A

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The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXII. The Discovery of Cepheids in NGC 1326A

Authors: Charles F. Prosser, Robert C. Kennicutt, Jr., Fabio Bresolin, Abhijit Saha, Shoko Sakai, Wendy L. Freedman, Jeremy R. Mould, Laura Ferrarese, Holland C. Ford, Brad K. Gibson, John A. Graham, John G. Hoessel, John P. Huchra, Shaun M. Hughes, Garth D. Illingworth, Daniel D. Kelson, Lucas Macri, Barry F. Madore, Nancy A. Silbermann, and Peter B. Stetson

Prosser et al. 1999 The Astrophysical Journal 525 80.

Provider: AAS Journals

Caption: Fig. 6.

V vs. V−I color‐magnitude diagram for NGC 1326A, based on DoPHOT photometry from median filtered images of the four WFPC2 chips. The recovered Cepheid sample is shown by filled circles. The expected ridgeline for Cepheids with ﹩10\leq P\leq 60﹩ days and zero reddening is drawn for reference, assuming an apparent distance modulus of 31.4 mag. Photometric error bars for a typical single epoch of observation are also shown.

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