Signatures of an Intermediate-Age Metal-Rich Bulge Population

Thomas Bensby, Sofia Feltzing, A. Gould, J. A. Johnson, M. Asplund, Daniel Adén, J. Melendez, J. G. Cohen, I. Thompson, S. Lucatello, A. Gal-Yam

    Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceedingPeer review

    Sammanfattning

    We have determined detailed elemental abundances and stellar ages for a sample of now 38 microlensed dwarf and subgiant stars in the Galactic bulge. Stars with sub-solar metallicities are all old and have enhanced alpha-element abundances - very similar to what is seen for local thick disk stars. The metal-rich stars on the other hand show a wide variety of stellar ages, ranging from 3-4 Gyr to 12 Gyr, and an average around 7-8 Gyr. The existence of young and metal-rich stars are in conflict with recent photometric studies of the bulge which claim that the bulge only contains old stars.
    Originalspråkengelska
    Titel på värdpublikationGalactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series)
    FörlagAstronomical Society of the Pacific (ASP)
    Sidor203-204
    Volym458
    ISBN (tryckt)978-1-58381-798-8
    StatusPublished - 2012
    EvenemangConference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way - Shezenji, JAPAN
    Varaktighet: 2011 nov. 12011 nov. 4

    Publikationsserier

    Namn
    Volym458

    Konferens

    KonferensConference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way
    Period2011/11/012011/11/04

    Ämnesklassifikation (UKÄ)

    • Astronomi, astrofysik och kosmologi

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