We report on the discovery of Cepheids in the spiral galaxy NGC2841, based on observations made with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope. NGC2841 was observed over 12 epochs using the F555W filter, and over 5 epochs using the F814W filter. Photometry was performed using the DAOPHOT/ALLFRAME package. We discovered a total of 29 variables, including 18 high-quality Cepheids with periods ranging from 15 to 40 days. Period-luminosity relations in the V and I bands, based on the high-quality Cepheids, yield a reddening-corrected distance modulus of 30.74 ± 0.23 mag, which corresponds to a distance of 14.1±1.5 Mpc. Our distance is based on an assumed LMC distance modulus of µ0 = 18.50±0.10 mag (D = 50±2.5 kpc) and a metallicity dependence of the Cepheid P-L relation of V I = −0.2±0.2 mag/dex. (Refer to PDF file for exact formulas).

Publication Date



This is the pre-print of an article published by the American Astronomical Society. The final, published version is available here: https://doi.org/10.1086/322395

© 2001 The American Astronomical Society

Also archived in: arXiv:astro-ph/0105491 v1 28 May 2001

We would like to thank the referee, John Graham, for his helpful comments, and the STScI and NASA support staff that have made these observations possible. This work has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, Caltech, under contract with the National Aeronautics and Space Administration.

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Document Type


Department, Program, or Center

School of Physics and Astronomy (COS)


RIT – Main Campus