CN anomalies in the halo system and the origin of globular clusters in the Milky Way

Daniela Carollo, Sarah L. Martell, Timothy C. Beers, Ken C. Freeman

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

We explore the kinematics and orbital properties of a sample of red giants in the halo system of the Milky Way that are thought to have formed in globular clusters based on their anomalously strong UV/blue CN bands. The orbital parameters of the CN-strong halo stars are compared to those of the inner- and outer-halo populations as described by Carollo et al., and to the orbital parameters of globular clusters with well-studied Galactic orbits. The CN-strong field stars and the globular clusters both exhibit kinematics and orbital properties similar to the inner-halo population, indicating that stripped or destroyed globular clusters could be a significant source of inner-halo field stars, and suggesting that both the CN-strong stars and the majority of globular clusters are primarily associated with this population.

Original languageEnglish
Article number87
Pages (from-to)1-12
Number of pages12
JournalAstrophysical Journal
Volume769
Issue number2
DOIs
Publication statusPublished - 1 Jun 2013

Keywords

  • Galaxy: evolution
  • Galaxy: formation
  • Galaxy: halo
  • Galaxy: structure
  • globular clusters: general
  • stars: abundances
  • surveys

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