The metallicity dependence of the cepheid period-luminosity relation: Methodology and results

Abstract

We present the results of an observational campaign undertaken to assess the influence of the iron content on the Cepheid Period-Luminosity relation. Our data indicate that this dependence is not well represented by a simple linear relation. Rather, the behaviour is markedly non monotonic, with the correction peaking at about solar metallicity and declining for higher and lower values of [Fe/H]. © 2006 Springer-Verlag Berlin Heidelberg.