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

    23 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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