The metallicity dependence of the Cepheid Period-Luminosity relation

Details The metallicity dependence of the Cepheid Period-Luminosity relation The metallicity dependence of the Cepheid Period-Luminosity relation

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop...73b&link_type=abstract

NOAO Proposal ID #2001B-0073

Physics

Scientific paper

We propose to obtain BVI photometry of Cepheids in the nearby galaxy M33. We argue that there is an urgent need for multi-color photometry at different metallicities in order to address the problem of the metallicity dependence of the Cepheid Period-Luminosity relation. Despite considerable recent efforts, this is still a widely open problem. We want to observe four fields in M33 with the WIYN telescope. This galaxy is the ideal place because of its large metallicity gradient. In the analysis we can use the constraint that all Cepheids are at the same distance. The data, combined with JHK photometry (already obtained) will allow to address this problem seriously and to settle this issue once and for all. This will have a direct impact on galaxy distances determined with the Hubble Space Telescope using Cepheids and it will eventually lead to a more accurate determination of the Hubble constant. It will also be beneficial to the extragalactic distance scale as a whole.

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