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

  • Johannes Andersen (a1) (a2), Birgitta Nordström (a1) (a2) and Terese T. Hansen (a3)

Abstract

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.

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References

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Carney, B. W., Latham, D. W., Stefanik, R. P., et al., 2003, AJ, 125, 293
Frebel, A. & Norris, J. E., 2015, ARAA, 53, 631
Hansen, T. T., Andersen, J., Nordström, B., et al. 2015abc, A&A, in press
Mathieu, R. D., Latham, D. W., & Griffin, R. F. 1990, AJ, 100, 1899
Mermilliod, J.-C., Andersen, J., Latham, D. W., & Mayor, M., 2007, A&A, 473, 829
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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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