Journal article

The extragalactic distance scale key project. XVI. Cepheid variables in an inner field of M101

PB Stetson, A Saha, L Ferrarese, DM Rawson, HC Ford, WL Freedman, BK Gibson, JA Graham, P Harding, M Han, RJ Hill, JG Hoessel, JP Huchra, SMG Huohes, GD Illingworth, DD Kelson, RC Kennicutt, BF Madore, JR Mould, RL Phelps Show all

The Astrophysical Journal | Published : 1998

Abstract

We report on the identification of 255 candidate variable stars in a field located some 1.7 from the center of the late-type spiral galaxy M101 = NGC 5457, based on observations made with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope. Photometric measurements in the F555W and F814W filters - analyzed independently with the DAOPHOT/ALLFRAME and DoPHOT software suites - have been transformed to the Johnson V and Kron-Cousins 1 standard magnitude systems. Periods and intensity-averaged mean magnitudes for 61 carefully selected candidate Cepheid variables with periods in the range 10-48 days indicate a reddening-corrected mean distance modulus (m - M)0 = 29.05 ± 0.14 ..

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