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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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