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        The COMBS Survey II: Distinguishing the Metal-Poor Bulge from the Halo Interlopers

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        2009.03886v1.pdf (PDF, 6Mb)
        Author
        Lucey, Madeline
        Hawkins, Keith
        Ness, Melissa
        Debattista, Victor P.
        Luna, Alice
        Asplund, Martin
        Bensby, Thomas
        Casagrande, Luca
        Feltzing, Sofia
        Freeman, Kenneth C.
        Kobayashi, Chiaki
        Marino, Anna F.
        Attention
        2299/23688
        Abstract
        The metal-poor stars in the bulge are important relics of the Milky Way's formation history, as simulations predict that they are some of the oldest stars in the Galaxy. In order to determine if they are truly ancient stars, we must understand the origins of this population. Currently, it is unclear if the metal-poor stars in the bulge ([Fe/H] <-1 dex) are merely halo interlopers, a unique accreted population, part of the boxy/peanut-shaped (B/P) bulge or a classical bulge population. In this work, we use spectra from the VLT/FLAMES spectrograph to obtain metallicity estimates using the Ca-II triplet (CaT) of 473 bulge stars (187 of which have [Fe/H] 50\% probability of being bound to the bulge, and half are halo interlopers. We also see that the occurrence rate of halo interlopers increases steadily with decreasing metallicity across the full range of our sample (-3 <[Fe/H] <0.5). Our examination of the kinematics of the confined compared to the unbound stars indicates the metal-poor bulge ([Fe/H] <-1 dex) comprises at least two populations; those confined to the boxy/peanut bulge and halo stars passing through the inner galaxy. We conclude that an orbital analysis approach, as we have employed, is important to uncover and understand the composite nature of the metal-poor stars in the inner region.
        Publication date
        2021-01-06
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stab003
        Other links
        http://hdl.handle.net/2299/23688
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