The HST Key Project on the Extragalactic Distance Scale: Cepheid Variables in NGC 925

Details The HST Key Project on the Extragalactic Distance Scale: Cepheid Variables in NGC 925 The HST Key Project on the Extragalactic Distance Scale: Cepheid Variables in NGC 925

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.0601s&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #06.01; Bulletin of the American Astronomical Society, Vol. 27, p.820

Astronomy and Astrophysics

Astronomy

Scientific paper

Results on the search for Cepheid variables in the nearby spiral galaxy NGC 925 are presented. NGC 925, as a member of the NGC 1023 galaxy group, was chosen as a calibrator for several secondary distance indicators such as the Tully-Fisher relation, surface brightness fluctuations, planetary nebulae, and type II supernovae, as part of the HST Key Project on the Extragalactic Distance Scale. V, I, and B exposures of an outer field of NGC 925 were made from August to October 1994 using WFPC-2 on HST. Twelve epochs in V were obtained, as well as a 4 epochs in I and 3 in B for color and reddening determinations. Eighty Cepheids have been discovered in NGC 925. Periods, light and color curves for the variables will be presented, as well as V and I period-luminosity relations. These PL relations will be used to establish the distance and absolute magnitude for this galaxy. A color-magnitude diagram of the region will also be presented.

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