The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. VI. The Cepheids in NGC 925

Details The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. VI. The Cepheids in NGC 925 The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. VI. The Cepheids in NGC 925

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...470....1s&link_type=abstract

Astrophysical Journal v.470, p.1

Astronomy and Astrophysics

Astronomy

95

Stars: Variables: Cepheids, Galaxies: Individual Ngc Number: Ngc 925, Cosmology: Distance Scale

Scientific paper

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) epochs of cosmic-ray split observations were obtained. Eighty Cepheids were discovered, with periods from 6 to ~80 days. Light curves of the Cepheids are presented, and their corresponding period-luminosity diagrams are discussed. Using a distance modulus for the Large Magellanic 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, corresponding 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.

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