The Dependency of the Cepheid Period-Luminosity Relation on Chemical Composition
Abstract
The dependency of the Cepheid Period-Luminosity Relation on chemical composition at different wavelengths is assessed via direct detailed abundance analysis of Galactic and Magellanic Cepheids, as derived from high resolution, high signal-to-noise spectra. Our measurements span one order of magnitude in iron content and allow to rule out at the ~ 9 sigma level the universality of the Period-Luminosity Relation in the V band, with metal rich stars being fainter than metal poor ones by ~0.3 mag. The dependency is less pronounced in the K band. Its magnitude and statistical significance decisively depend on detailed distance measurements to individual stars, as inferred via the Infrared Surface Brightness Method.
Keywords
Cite
@article{arxiv.0907.3655,
title = {The Dependency of the Cepheid Period-Luminosity Relation on Chemical Composition},
author = {M. Romaniello and F. Primas and M. Mottini and S. Pedicelli and B. Lemasle and G. Bono and P. Francois and M. A. T. Groenewegen and C. D. Laney},
journal= {arXiv preprint arXiv:0907.3655},
year = {2015}
}
Comments
3 pages, 2 figures, to be published in "Stellar Pulsation: Challenges for Theory and Observation" (31 May - 5 June, Santa Fe, New Mexico). Minor typos fixed in v2