NOAO >   Observing Info >   Approved Programs >   2009B-0051

Small NOAO Logo

Proposal Information for 2009B-0051


PI: Barry F. Madore, Carnegie Institution of Washington, barry@ociw.edu
Address: The Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA

CoI: Wendy L. Freedman, Carnegie Observatories
CoI: Victoria Scowcroft, Liverpool John Moores University

Title: Calibrating The Metallicity Sensitivity of the Cepheid Period-Luminosity Relation at Near-Infrared Wavelengths

Abstract: We are proposing to undertake the first test for and calibration of the metallicity sensitivity of the Cepheid Period-Luminosity relation in the near-infrared. From the ground and from space several groups are mounting major efforts to recalibrate the extragalactic distance scale using K-band observations of Cepheids. By observing Cepheids in M33 at different radii, sampling different metallicities, we will be able to calibrate the sensitivity of the zero point of the Cepheid PL relation to metallicity in the K band. This will directly address one of the largest remaining systematics in the near-infrared Cepheid distance scale.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2009B-0051

noaoprop-help@noao.edu

Small NOAO Logo