Cepheid Variable Stars in the Galaxy NGC 925

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Session 24 -- The Distance Scale
Display presentation, Monday, 9, 1995, 9:20am - 6:30pm

[24.07] Cepheid Variable Stars in the Galaxy NGC 925

N.A. Silbermann, B.F. Madore (JPL), L. Ferrarese, H. Ford, A. Saha (STSci), W.L. Freedman, R.J. Hill (OCIW), J.A. Graham (CIW), J.G. Hoessel (U Wisc), J.P. Huchra (CFA), S.M. Hughes (RGO), G.D. Illingworth (Lick/UCSC), R.C. Kennicutt (U Ariz), J.R. Mould (ANU), P.B. Stetson (DAO)

Preliminary results on a search for Cepheid variables in the nearby spiral galaxy NGC 925 will be presented. NGC 925 was chosen as a potential calibrator for the Tully-Fisher relation, as part of the HST Key Project on the Extragalactic Distance Scale. The period-luminosity relation for the Cepheids discovered in NGC 925 will be used to establish the distance and absolute magnitude for this galaxy. B, V, and I exposures of an outer field to the west side 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 reduced number of observations at B and I for color and reddening determinations. Several dozen Cepheids have been discovered. Lightcurves for these variables will be presented, as well as V and I period-luminosity relations. A color-magnitude diagram of the region will also be discussed.

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