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Chemical Fingerprinting and Chemical Analysis of Galactic Halo Substructure

Published online by Cambridge University Press:  09 March 2010

Steven R. Majewski ,
Mei-Yin Chou ,
Katia Cunha ,
Verne V. Smith ,
Richard J. Patterson  and
David Martínez-Delgado
Steven R. Majewski
Affiliation:
Dept. of Astronomy, University of Virginia, Charlottesville, VA 22904-4325, USA
Mei-Yin Chou
Affiliation:
Dept. of Astronomy, University of Virginia, Charlottesville, VA 22904-4325, USA
Katia Cunha
Affiliation:
National Optical Astronomy Observatories, PO Box 26732, Tucson, AZ 85726, USA
Verne V. Smith
Affiliation:
National Optical Astronomy Observatories, PO Box 26732, Tucson, AZ 85726, USA
Richard J. Patterson
Affiliation:
Dept. of Astronomy, University of Virginia, Charlottesville, VA 22904-4325, USA
David Martínez-Delgado
Affiliation:
Instituto de Astrofisica de Canarias, La Laguna, Spain
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Abstract

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We present high-resolution spectroscopic measurements of the abundances of the α-like element titanium (Ti) and s-process elements yttrium (Y) and lanthanum (La) for M giant candidates of (a) the Sagittarius (Sgr) dwarf spheroidal + tidal tail system, (b) the Triangulum-Andromeda (TriAnd) Star Cloud, and (c) the Galactic Anticenter Stellar Structure (GASS, or Monoceros Stream). All three systems show abundance patterns unlike the Milky Way but typical of dwarf galaxies. The Sgr system abundance patterns resemble those of the Large Magellanic Cloud. GASS/Mon chemically resembles Sgr but is distinct from TriAnd, a result that does not support previous suggestions that TriAnd is a piece of the Monoceros Stream.

Keywords

galaxies: interactionsGalaxy: haloGalaxy: structurestars: abundances
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. 364 - 365
Copyright
Copyright © International Astronomical Union 2010

References

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