Mathematics – Logic
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8354s&link_type=abstract
HST Proposal ID #8354
Mathematics
Logic
Hst Proposal Id #8354 Clusters Of Galaxies And Lensing
Scientific paper
We propose to use the archival observations by the HST/WFPC2 in two important galaxies in the cosmological distance ladder, M31 and M33, to identify the variable stars we have already discovered from the ground. The new variables come from our project, called DIRECT, aiming to obtain the distances to M31 and M33 using detached eclipsing binaries and Cepheids. Combining photometry and spectroscopy for a selected subsample of binaries and Cepheids allows us to derive direct distance of high accuracy, which rely on no intermediate steps. We expect to identify 20-30 HST/WFPC2 images, thus improving significantly their photometry by quantifying systematic effects due to crowding. This should aid in both the accuracy and precision of our direct distance determination to M31 and M33, which are stepping stones for most of our current efforts to understand the evolving universe at large scales. Thus we expect to help in decreasing the HST Key Project's overall uncertainty in deriving the Hubble constant, H_0, by a factor of 2 {or to about 5.
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