Journal article

The extragalactic distance scale key project. IV. The discovery of cepheids and a new distance to M100 using the Hubble Space Telescope

L Ferrarese, WL Freedman, RJ Hill, A Saha, BF Madore, RC Kennicutt, PB Stetson, HC Ford, JA Graham, JG Hoessel, M Han, J Huchra, SM Hughes, GD Illingworth, D Kelson, JR Mould, R Phelps, NA Silbermann, S Sakai, A Turner Show all

The Astrophysical Journal | Published : 1996

Abstract

We report on observations of Cepheids in the Virgo spiral galaxy M100, based on data obtained with the Wide Field and Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST). The observations are part of the HST Key Project on the Extragalactic Distance Scale, which aims to provide a measurement of the Hubble constant H0 with 10% accuracy. A total of 12 epochs were obtained using the F555W filter (transformed to Johnson V), and 4 epochs using the F814W filter (transformed to Cousins I). Photometry on the data was performed using two independent packages, DoPHOT and DAOPHOT II/ALLFRAME; a total of 52 Cepheids, with periods ranging from about 10 to 70 days, were identified based o..

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