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[Fe/H] and [$\alpha$/Fe] of cepheids in the outer galactic disk

Published online by Cambridge University Press:  23 December 2005

Bruce W. Carney  and
David Yong
Bruce W. Carney
Affiliation:
Dept. of Physics & Astronomy, Univ. of North Carolina, Chapel Hill, NC 27599 USA email: bruce@physics.unc.edu; yong@physics.unc.edu
David Yong
Affiliation:
Dept. of Physics & Astronomy, Univ. of North Carolina, Chapel Hill, NC 27599 USA email: bruce@physics.unc.edu; yong@physics.unc.edu
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Abstract

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We have derived [Fe/H] and [α/Fe] abudnances for Cepheids with Galactocentric distances of 11 to 17 kpc. The stars are as metal-poor as much older open clusters at comparable distances. Like the clusters, and despite their youth, the Cepheids also show enhanced [α/Fe] abundances indicating enhanced contributions from SNe II relative to the Solar neighborhood.

Keywords

Galaxy: abundancesGalaxy: diskGalaxy: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 245 - 246
Copyright
© 2005 International Astronomical Union