The Cepheid PL-Z

Details The Cepheid PL-Z The Cepheid PL-Z

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10433m&link_type=abstract

HST Proposal ID #10433

Computer Science

Hst Proposal Id #10433 Cool Stars

Scientific paper

We are proposing to empirically calibrate the metallicity sensitivity of the Cepheid Period-Luminosity relation at the highest metallicity range so far observed in nearby galaxies. To do this we will obtain the I-band Population II Tip of the Red Giant Branch {TRGB} distances to two galaxies, NGC 3627 and NGC 3368, both of which have comparable {Cepheid} distances of 11 Mpc and have almost identical {very high} metallicities of 12 + log[O/H] = +9.3. At present, observers have extremely divergent views on the magnitude of the metallicity effect on the Cepheid zero point, and theorists cannot even agee upon the sign of the effect.

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