Journal article

The Extragalactic Distance Scale Key Project. VIII. The discovery of Cepheids and a new distance to NGC 3621 using the Hubble Space Telescope

DM Rawson, LM Macri, JR Mould, JP Huchra, WL Freedman, RC Kennicutt, L Ferrarese, HC Ford, JA Graham, P Harding, M Han, RJ Hlll, JG Hoessel, SMG Hughes, GD Illingworth, BF Madore, RL Phelps, A Saha, S Sakai, NA Sllbermann Show all

The Astrophysical Journal | Published : 1997

Abstract

We report on the discovery of Cepheids in the field spiral galaxy NGC 3621, based on observations made with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope (HST). NGC 3621 is one of 18 galaxies observed as a part of the HST Key Project on the Extragalactic Distance Scale, which aims to measure the Hubble constant to 10% accuracy. Sixty-nine Cepheids with periods in the range 9-60 days were observed over 12 epochs using the F555W filter, and over four epochs using the F814W filter. The HST F555W and F814W data were transformed to the Johnson V and Kron-Cousins I magnitude systems, respectively. Photometry was performed using two independent packages, DAOPHOT II/ALLFRAME ..

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