Metallicity Dependence of the Cepheid Calibration

Details Metallicity Dependence of the Cepheid Calibration Metallicity Dependence of the Cepheid Calibration

1997-07-21

arxiv.org/abs/astro-ph/9707229v1

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

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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