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Chemical characterization of the inner Galactic bulge: North-South symmetry
Univ Cote dAzur, Observ Cote dAzur, Lab Lagrange, CNRS, Blvd Observ, F-06304 Nice, France.
Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, SE-22100 Lund, Sweden.
Univ Cote dAzur, Observ Cote dAzur, Lab Lagrange, CNRS, Blvd Observ, F-06304 Nice, France.
Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, SE-22100 Lund, Sweden.
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2018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 478, no 4, p. 4374-4389Article in journal (Refereed) Published
Abstract [en]

While the number of stars in the Galactic bulge with detailed chemical abundance measurements is increasing rapidly, the inner Galactic bulge (vertical bar b vertical bar < 2 degrees) remains poorly studied, due to heavy interstellar absorption and photometric crowding. We have carried out a high-resolution IR spectroscopic study of 72 M giants in the inner bulge using the CRIRES (ESO/VLT) facility. Our spectra cover the wavelength range of 2.0818-2.1444 mu m with the resolution of R similar to 50 000 and have signal-to-noise ratio of 50: 100. Our stars are located along the bulge minor axis at l = 0 degrees, b= +/- 0 degrees, +/- 1 degrees, +/- 2 degrees, and + 3 degrees. Our sample was analysed in a homogeneous way using the most current K-band line list. We clearly detect a bimodal metallicity distribution function with a metal-rich peak at similar to + 0.3 dex and a metal-poor peak at similar to -0.5 dex and no stars with [Fe/H] > + 0.6 dex. The Galactic Centre field reveals in contrast a mainly metal-rich population with a mean metallicity of + 0.3 dex. We derived [Mg/Fe] and [Si/Fe] abundances that are consistent with trends from the outer bulge. We confirm for the supersolar metallicity stars the decreasing trend in [Mg/Fe] and [Si/Fe] as expected from chemical evolution models. With the caveat of a relatively small sample, we do not find significant differences in the chemical abundances between the Northern and the Southern fields; hence, the evidence is consistent with symmetry in chemistry between North and South.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2018. Vol. 478, no 4, p. 4374-4389
Keywords [en]
stars: abundances, stars: late-type, Galaxy: bulge
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-362839DOI: 10.1093/mnras/sty1255ISI: 000441288300008OAI: oai:DiVA.org:uu-362839DiVA, id: diva2:1255400
Funder
Swedish Research Council, 621-2014-5640Knut and Alice Wallenberg FoundationThe Crafoord FoundationStiftelsen Olle Engkvist ByggmästareAvailable from: 2018-10-12 Created: 2018-10-12 Last updated: 2018-10-12Bibliographically approved

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