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[Si/Ti] elemental ratios in 9 old halo globular clusters

Published online by Cambridge University Press:  23 December 2005

Jae-Woo Lee  and
Bruce W. Carney
Jae-Woo Lee
Affiliation:
Astrophysical Research Center for the Structure and Evolution of the Cosmos, Department of Astronomy and Space Science, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul, 143-747, Korea email: jaewoolee@sejong.ac.kr
Bruce W. Carney
Affiliation:
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599-3255, USA email: bruce@physics.unc.edu
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Abstract

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We present elemental abundance ratios for red giant stars in 9 old halo globular clusters based on the homogeneous data sample and analysis method. Our result suggests that [Si/Ti] ratios in old globular clusters decrease with Galactocentric distances, confirming the previous result by Lee & Carney (2002). We propose that contributions from different masses of the Type II suprenovae progenitors that enriched proto-globular clusters' clouds are responsible for this gradient.

Keywords

Globular clustersstars: abundance
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. 401 - 402
Copyright
© 2005 International Astronomical Union