Cepheid Variables in the Antennae Conference Paper uri icon


  • An accurate measurement of the Hubble constant provides important constraints on the equation of state of dark energy. Currently, the most robust determination of H 0 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. © 2009 American Institute of Physics.

author list (cited authors)

  • Chavez, J. M., Macri, L. M., Riess, A. G., & Pellerin, A.

publication date

  • January 1, 2009 11:11 AM


  • AIP  Publisher