The Effect of Metallicity on the Cepheid Period-Luminosity Relation

Details The Effect of Metallicity on the Cepheid Period-Luminosity Relation The Effect of Metallicity on the Cepheid Period-Luminosity Relation

2003-12-04

arxiv.org/abs/astro-ph/0312121v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to appear in "Variable Stars in the Local Group", IAU Colloquium 193 proceedings, ASP Conference Series, D.

Scientific paper

We present preliminary results of an observational campaign devoted at establishing the influence of chemical composition on the Cepheid Period-Luminosity relation. The data are in good agreement with theoretical predictions based on non-linear convective models, suggesting a fairly strong dependence of the Period-Luminosity relation on metallicity in the sense of more metal rich stars being intrinsically fainter than otherwise expected. Our data indicate that the error on the inferred distance can be as large as 10% if the role of metallicity is neglected.

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