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r-Process Elements as Tracers of Enrichment Processes in the Early Halo

Published online by Cambridge University Press:  09 May 2016

Johannes Andersen ,
Birgitta Nordström  and
Terese T. Hansen
Johannes Andersen
Affiliation:
Dark Cosmology Centre, The Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark email: ja@nbi.ku.dk, birgitta@nbi.ku.dk Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
Birgitta Nordström
Affiliation:
Dark Cosmology Centre, The Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark email: ja@nbi.ku.dk, birgitta@nbi.ku.dk Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
Terese T. Hansen
Affiliation:
Landessternwarte, ZAH, Heidelberg University, Königstuhl 12, Heidelberg, D-69117, Germany email: thansen@lsw.uni-heidelberg.de
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Abstract

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Significant minorities of extremely metal-poor (EMP) halo stars exhibit dramatic excesses of neutron capture elements. The standard scenario for their origin is mass transfer and dilution in binary systems, but requires them to be binaries. If not, these excesses must have been implanted in them from birth by processes that are not included in current models of SN II chemical enrichment. The binary population of such EMP subgroups is a test of this scenario.

Keywords

Galaxy: halo – Stars: chemically peculiar – binaries: spectroscopic – ISM: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 272 - 273
Copyright
Copyright © International Astronomical Union 2016 

References

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