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The effect of metallicity on the Cepheid period-luminosity relation

Published online by Cambridge University Press:  12 April 2016

Martino Romaniello ,
Francesca Primas ,
Marta Mottini  and
Martin Groenewegen
Martino Romaniello
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching bei München, Germany
Francesca Primas
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching bei München, Germany
Marta Mottini
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching bei München, Germany
Martin Groenewegen
Affiliation:
Instituut voor Sterrenkunde, Celestijnenlaan 200B, B-3001 Leuven, Belgium

Abstract

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We present preliminary results of an observational campaign devoted to 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.

Type
Part 7. Chemical composition of variable stars
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 426 - 429
Copyright
Copyright © Astronomical Society of the Pacific 2004

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