Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-25
Astrophys.J.653:L101-L104,2006
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figs
Scientific paper
10.1086/510453
Our analysis of the Deep CFHT M33 variability survey database has uncovered 5 Beat Cepheids (BCs) that are pulsating in the fundamental and first overtone modes. With {\it only} the help of stellar pulsation theory and of mass--luminosity (M-L) relations, derived from evolutionary tracks, we can accurately determine the metallicities Z of these stars. The [O/H] metallicity gradient of -0.16 dex/kpc that is inferred from the M33 galacto-centric distances of these Cepheids and from their 'pulsation' metallicities is in excellent agreement with the standard spectroscopic metallicity gradients that are determined from H II regions, early B supergiant stars and planetary nebulae. Beat Cepheids can thus provide an additional, independent probe of galactic metallicity distributions.
Beaulieu J.-Ph.
Buchler Jean-Robert
Hartman Joel D.
Marquette Jean-Babtiste
Schwarzenberg-Czerny Aleksander
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