Journal article

The rubble space telescope extragalactic distance scale key project. IX. The discovery of cepheids in NGC 2090

RL Phelps, S Sakai, WL Freedman, BF Madore, A Saha, PB Stetson, RC Kennicutt, JR Mould, L Ferrarese, HC Ford, BK Gibson, JA Graham, M Han, JG Hoessel, JP Huchra, SM Hughes, GD Illingvorth, NA Silbermann

The Astrophysical Journal | Published : 1998

Abstract

We report on the discovery of 34 Cepheid variables in NGC 2090, with periods ranging between 5 and 58 days. Apparent V and I period-luminosity relations for Cepheids with P ≥ 10 days have been constructed, assuming a fiducial distance modulus, μ0, of 18.50 ± 0.10 mag and a reddening, E(B- V), of 0.10 mag for the Large Magellanic Cloud. Using the ALLFRAME photometry package, an inferred reddening of E(V-I) = 0.09 ± 0.02 mag (internal error) and a true distance modulus of 30.45 ± 0.16 (random) ± 0.16 (systematic) mag for NGC 2090 are found. The corresponding distance is 12.3 ± 0.9 (random) ± 0.9 (systematic) Mpc, a value that agrees at the 2.5% level with that derived from an independent analy..

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