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Detailed Chemical Abundances in a Metal-Poor Stellar Stream

Published online by Cambridge University Press:  09 March 2010

Ian U. Roederer ,
Christopher Sneden ,
Ian B. Thompson ,
George W. Preston  and
Stephen A. Shectman
Ian U. Roederer
Affiliation:
Department of Astronomy, University of Texas at Austin, Austin, TX 78712 email: iur@astro.as.utexas.edu
Christopher Sneden
Affiliation:
Department of Astronomy, University of Texas at Austin, Austin, TX 78712 email: iur@astro.as.utexas.edu
Ian B. Thompson
Affiliation:
The Observatories of the Carnegie Institution of Washington, Pasadena, CA 91101
George W. Preston
Affiliation:
The Observatories of the Carnegie Institution of Washington, Pasadena, CA 91101
Stephen A. Shectman
Affiliation:
The Observatories of the Carnegie Institution of Washington, Pasadena, CA 91101
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Abstract

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We have observed 9 bright metal-poor stars whose kinematics suggest they are members of a stellar stream in the vicinity of the Solar neighborhood. These 9 stars exhibit no star-to-star dispersion in their [X/Fe] ratios for the α and Fe-peak elements, and the neutron-capture elements suggest mild enrichment by the main r-process. The abundance patterns seen in this stream are very similar to those found in the metal-poor globular cluster M15, and the kinematics of M15 are similar to those of the stream, suggesting that these two groups of stars may have shared a common origin.

Keywords

Stars: abundancesstars: kinematicsstars: Population IIglobular clusters: individual (M15)Galaxy: halo
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 368 - 369
Copyright
Copyright © International Astronomical Union 2010

References

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