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A Comparison of Copper Abundances in Globular Cluster and Halo Field Giant Stars

We derive [Cu/Fe] for 117 giant stars in 10 globular clusters (M3, M4, M5, M10, M13, M15, M71, NGC 7006, NCG 288, and NGC 362) and find that globular cluster Cu abundances appear to follow [Cu/Fe] trends found in the field. This result is interesting in light of recent work, which indicates that the globular cluster ω Centauri shows no trend in [Cu/Fe] with [Fe/H] over the abundance range -2.0<[Fe

Model Reduction of Spatially Distributed Systems Using Coprime Factors and Semidefinite Programming

In this paper an order reduction method for spatially distributed models is presented. Such systems may be modeled as two nodes interacting with each other through feedback. A model of one of the nodes reduced in such a way, that the closed loop performance is approximated. The method exploits a coprime factor description of the closed loop model and semidefinite programming. The method is related