Abundance Trends in the Inner and Outer Galactic Disk

Thomas Bensby, A. Alves-Brito, M. S. Oey, D. Yong, J. Melendez

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

    Sammanfattning

    Based on high-resolution spectra obtained with the MIKE spectrograph on the Magellan telescopes we present detailed elemental abundances for 64 red giant stars in the inner and outer Galactic disk. For the inner disk sample (4-7 kpc from the Galactic centre) we find that stars with both thin and thick disk abundance patterns are present while for Galactocentric distances beyond 10 kpc, we only find chemical patterns associated with the local thin disk, even for stars far above the Galactic plane. Our results show that the relative densities of the thick and thin disks are dramatically different from the solar neighbourhood, and we therefore suggest that the radial scale length of the thick disk is much shorter than that of the thin disk. A thick disk scale-length of L-thick = 2.0 kpc, and L-thin = 3.8 kpc for the thin disk, better match the data.
    Originalspråkengelska
    Titel på värdpublikationGalactic archeology, near-field cosmology and the formation of the Milky Way (ASP Conference Series)
    FörlagAstronomical Society of the Pacific (ASP)
    Sidor171-174
    Volym458
    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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