chemical abundances of halo stars

Kathryn Johnston came downtown for the afternoon to discuss matters of chemical abundances and the accretion history of the halo. She has some of the seminal work on the relationships between chemical abundances and kinematics that we might expect in the standard model of galaxy formation. We looked at how we might make a model of the Milky Way halo that is a mixture of stellar populations, each of which has a sensible chemical-enrichment history. That would be a step towards understanding the accretion origin of the halo. We also discussed how we might identify halo stars that clearly came from the disk, on the basis of chemical signatures. All this with our huge sample of stars from APOGEE DR12, with fifteen chemical abundances.

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