Metallicity Dependence of the Cepheid Calibration

1997/07/21 by M. Sekiguchi, Sekiguchi, M., M. Fukugita +1
Engineering · Physics and Astronomy · Social Sciences · #Metallurgy and Cultural Artifacts #Powder Metallurgy Techniques and Materials #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/9707229

8 pages, TeX, 3 PostScript figures, submitted to THE OBSERVATORY

arxiv created 1997/07/21 · arxiv updated 2009/12/01

Abstract

We point out that the absolute magnitude of the Galactic Cepheids, which have been used for local calibrations for Cepheid period-luminosity relation, shows an unexpectedly large metal abundance effect. This indicates that either Cepheids period luminosity relation has a large metallicity dependence, much larger than expected in stellar pulsation models, or the unreddened distances to clusters contain a large systematic error arising from the neglect of the metallicity effect. This effect may introduce an uncertainty of --0.4 to +0.1 mag into the distance to the LMC estimated using the Cepheid PL relation.

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