Journal article
The EMBLA survey - metal-poor stars in the Galactic bulge
Monthly notices of the Royal Astronomical Society, Vol.460(1), pp.884-901
07/21/2016
DOI: 10.1093/mnras/stw1004
Abstract
Cosmological models predict the oldest stars in the Galaxy should be found closest to the centre of the potential well, in the bulge. The Extremely Metal-poor BuLge stars with AAOmega survey (EMBLA) successfully searched for these old, metal-poor stars by making use of the distinctive SkyMapper photometric filters to discover candidate metal-poor stars in the bulge. Their metal-poor nature was then confirmed using the AAOmega spectrograph on the Anglo-Australian Telescope. Here we present an abundance analysis of 10 bulge stars with -2.8 < [Fe/H] < -1.7 from MIKE/Magellan observations, in total determining the abundances of 22 elements. Combining these results with our previous high-resolution data taken as part of the Gaia-ESO Survey, we have started to put together a picture of the chemical and kinematic nature of the most metal-poor stars in the bulge. The currently available kinematic data are consistent with the stars belonging to the bulge, although more accurate measurements are needed to constrain the stars' orbits. The chemistry of these bulge stars deviates from that found in halo stars of the same metallicity. Two notable differences are the absence of carbon-enhanced metal-poor bulge stars, and the alpha element abundances exhibit a large intrinsic scatter and include stars which are underabundant in these typically enhanced elements.
Details
- Title: Subtitle
- The EMBLA survey - metal-poor stars in the Galactic bulge
- Creators
- Louise M. Howes - Lund UniversityMartin Asplund - Mount Stromlo ObservatoryStefan C. Keller - Mount Stromlo ObservatoryAndrew R. Casey - University of CambridgeDavid Yong - Mount Stromlo ObservatoryKarin Lind - Uppsala UniversityAnna Frebel - Massachusetts Institute of TechnologyAustin Hays - Massachusetts Institute of TechnologyAlan Alves-Brito - Universidade Federal do Rio Grande do SulMichael S. Bessell - Mount Stromlo ObservatoryLuca Casagrande - Mount Stromlo ObservatoryAnna F. Marino - Mount Stromlo ObservatoryDavid M. Nataf - Mount Stromlo ObservatoryChristopher I. Owen - Mount Stromlo ObservatoryGary S. Da Costa - Mount Stromlo ObservatoryBrian P. Schmidt - Mount Stromlo ObservatoryPatrick Tisserand - Institut d'Astrophysique de Paris
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.460(1), pp.884-901
- Publisher
- Oxford Univ Press
- DOI
- 10.1093/mnras/stw1004
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Number of pages
- 18
- Grant note
- 320360 / European Union FP7 programme through ERC grant; European Research Council (ERC) National Science Foundation; National Science Foundation (NSF) FT140100554 / Australian Research Council FL110100012; FT140100554; DP120101237; DP150103294 / Australian Research Council National Aeronautics and Space Administration; National Aeronautics & Space Administration (NASA)
- Language
- English
- Date published
- 07/21/2016
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701726102771
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