THE HUBBLE-SPACE-TELESCOPE KEY PROJECT ON THE EXTRAGALACTIC DISTANCE SCALE .6. THE CEPHEIDS IN NGC-925

We report the detection of Cepheid variable stars in the barred spiral galaxy NGC 925, using the Hubble Space Telescope (HST) Wide-Field and Planetary Camera 2 (WFPC2). Twelve V (F555W) and four I (F814W) epoch s of cosmic-ray split observations were obtained. Eighty Cepheids were discovered, with periods from 6 to similar to 80 days. Light curves o f the Cepheids are presented, and their corresponding period-luminosit y diagrams are discussed. Using a distance modulus for the Large Magel lanic Cloud Cepheids of 18.50 mag and an extinction of E(V-I)=0.13 mag , the measured distance modulus to NGC 925 is 29.84+/-0.16 mag, corres ponding to a distance of 9.29+/-0.69 Mpc. A mean reddening of E(V-I)=0 .17 mag is found for the Cepheids in this region of NGC 925.