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

2005-10-18

arxiv.org/abs/astro-ph/0510521v1

Mem.Soc.Ast.It.77:172-173,2006

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the Workshop "Stellar pulsation and evolution", 2005. Monte Porzio Catone, Italy. Eds.: A. R.

Scientific paper

We have assessed the influence of the stellar iron content on the Cepheid Period-Luminosity (PL) relation by relating the V band residuals from the Freedman et al (2001) PL relation to [Fe/H] for 68 Galactic and Magellanic Cloud Cepheids. The iron abundances were measured from FEROS and UVES high-resolution and high signal-to-noise optical spectra. Our data indicate that the stars become fainter as metallicity increases, until a plateau or turnover point is reached at about solar metallicity. This behavior appears at odds both with the PL relation being independent from iron abundance and with Cepheids becoming monotonically brighter as metallicity increases (e.g. Kennicutt et al 1998, Sakai et al 2004).

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