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26 April 2024 |
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Detection of Beat Cepheids in M33 and Their Use as a Probe of the M33 Metallicity Distribution | J.-P. Beaulieu
; J. Robert Buchler
; J.-B. Marquette
; J.D. Hartman
; A. Schwarzenberg-Czerny
; | Date: |
25 Oct 2006 | Abstract: | 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. | Source: | arXiv, astro-ph/0610749 | Services: | Forum | Review | PDF | Favorites |
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