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).
Department, Program, or Center
School of Physics and Astronomy (COS)
Astrophysical Journal 559N1 (2001) 243-259
RIT – Main Campus