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Paper: Cepheid Variables in the Antennae
Volume: 432, New Horizons in Astronomy: Frank N. Bash Symposium 2009
Page: 202
Authors: Chavez, J. M.; Macri, L. M.; Riess, A. G.; Pellerin, A.
Abstract: An accurate measurement of the Hubble constant provides important constraints on the equation of state of dark energy. Currently, the most robust determination of H0 is based on Cepheid distances to nearby type Ia supernovae. The occurrence of SN 2007sr in the Antennae (NGC 4038/39) provides an important additional calibrator for this method since this galaxy pair is within a distance that Cepheid variables can be resolved with HST. We have recently obtained a set of 12 epochs of WFPC2 images which we have analyzed using a previously obtained set of ACS data as reference. An earlier WFPC2 image was also included in our study. We present preliminary periods and magnitudes of Cepheids in this galaxy pair.
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