Other
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8584k&link_type=abstract
HST Proposal ID #8584
Other
Hst Proposal Id #8584 Cosmology
Scientific paper
Uncertainty in the metal abundance dependence of the Cepheid PL relation remains as one of the largest sources of systematic error in the Cepheid distance scale and in the extragalactic distance scale as a whole. We propose to directly test and calibrate the metallicity dependence of the PL relation, by obtaining independent Pop II based distances to a sample of 6 Cepheid host galaxies with {Cepheid} metal abundances {0.2-2 Z_odot}, using the tip of the red giant branch {TRGB} method. The TRGB method offers the optimal combination of precision and metallicity insensitivity for this test. When combined with currently available Cepheid and TRGB distances, these data will provide: {1} A robust empirical calibration of the Cepheid metallicity dependence; {2} Hard limits on the systematic error in H_0 from metallicity effects; {3} Empirical constraints on theoretical models of Cepheids; {4} Tight limits on other systematic errors in Cepheid distances as functions of distance, stellar crowding, and extinction; {5} A valuable Pop II based cross- check on the zeropoint of the Pop I distance ladder.
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