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Solar Vicinity: Star of Extragalactic Origin

Published online by Cambridge University Press:  23 December 2005

Vladimir A. Marsakov  and
Tatyana V. Borkova
Vladimir A. Marsakov
Affiliation:
Spas Reseach Department, Rostov State University of Rossia, Sorge st., 5, 344090, Russia email: [email protected], [email protected]
Tatyana V. Borkova
Affiliation:
Spas Reseach Department, Rostov State University of Rossia, Sorge st., 5, 344090, Russia email: [email protected], [email protected]
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Abstract

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Using a kinematic criterion reveals stars of extragalactic origin from our sample. We show that the ratios of r- and α-elements in all the accreted stars differ sharply from those in the stars that are genetically associated with the Galaxy. Since the majority of accreted stars of our sample exhibit a significant Eu overabundance relative to Mg, we conclude that the maximum masses of the SN II progenitors outside the Galaxy were much lower than those inside it. We provide evidence that the maximum mass of the SN II progenitors increased in the Galaxy with time simultaneously with the increase in mean metallicity.

Keywords

Stars: abundancesGalaxy: evolutionGalaxy: 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. 543 - 544
Copyright
© 2005 International Astronomical Union