Journal article

The hubble space telescope extragalactic distance scale key project. X. The cepheid distance to NGC 7331

SMG Hughes, M Han, J Hoessel, WL Freedman, RC Kennicutt, JR Mould, A Saha, PB Stetson, BF Madore, NA Silbermann, P Harding, L Ferrarese, H Ford, BK Gibson, JA Graham, R Hill, J Huchra, GD Illingworth, R Phelps, S Sakai

The Astrophysical Journal | Published : 1998


The distance to NGC 7331 has been derived from Cepheid variables observed with the Hubble Space Telescope (HST) WFPC2, as part of the Extragalactic Distance Scale Key Project. Multiepoch exposures in F555W (∼V) and F814W (∼1), with photometry derived independently from DoPHOT and DAOPHOT/ALLFRAME programs, were used to detect a total of 13 reliable Cepheids, with periods between 11 and 42 days. The relative distance moduli between NGC 7331 and the LMC, derived from the V and I magnitudes, imply an extinction to NGC 7331 of AV = 0.47 ± 0.15 mag and an extinction-corrected distance modulus to NGC 7331 of 30.89 ± 0.14 (random), equivalent to a distance of 15.1-0.9+1.0 Mpc. There are additional ..

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