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Chrono-chemodynamical analysis of the globular cluster NGC 6355 : Looking for the fundamental bricks of the Bulge

Souza, S. O. (author)
University of São Paulo,Leibniz Institute for Astrophysics Potsdam (AIP)
Ernandes, H. (author)
Lund University,Lunds universitet,Geologiska institutionen,Naturvetenskapliga fakulteten,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Department of Geology,Faculty of Science,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,University of São Paulo
Valentini, M. (author)
Leibniz Institute for Astrophysics Potsdam (AIP)
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Barbuy, B. (author)
University of São Paulo
Chiappini, C. (author)
Leibniz Institute for Astrophysics Potsdam (AIP)
Pérez-Villegas, A. (author)
National Autonomous University of Mexico
Ortolani, S. (author)
University of Padova,INAF - Osservatorio Astronomico di Padova
Friaça, A. C.S. (author)
University of São Paulo
Queiroz, A. B.A. (author)
University of Potsdam,Leibniz Institute for Astrophysics Potsdam (AIP)
Bica, E. (author)
Federal University of Rio Grande do Sul
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 (creator_code:org_t)
2023-03-03
2023
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 671
Related links:
http://dx.doi.org/10... (free)
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The information on Galactic assembly time is imprinted on the chemodynamics of globular clusters. This makes them important probes that help us to understand the formation and evolution of the Milky Way. Discerning between in-situ and ex-situ origin of these objects is difficult when we study the Galactic bulge, which is the most complex and mixed component of the Milky Way. To investigate the early evolution of the Galactic bulge, we analysed the globular cluster NGC 6355. We derived chemical abundances and kinematic and dynamic properties by gathering information from high-resolution spectroscopy with FLAMES-UVES, photometry with the Hubble Space Telescope, and Galactic dynamic calculations applied to the globular cluster NGC 6355. We derive an age of 13:2 ± 1:1 Gyr and a metallicity of [Fe/H] =-1:39 ± 0:08 for NGC 6355, with α-enhancement of [α/Fe] = +0:37 ± 0:11. The abundance pattern of the globular cluster is compatible with bulge field RR Lyrae stars and in-situ well-studied globular clusters. The orbital parameters suggest that the cluster is currently confined within the bulge volume when we consider a heliocentric distance of 8:54 ± 0:19 kpc and an extinction coefficient of RV = 2:84 ± 0:02. NGC 6355 is highly likely to come from the main bulge progenitor. Nevertheless, it still has a low probability of being formed from an accreted event because its age is uncertain and because of the combined [Mg/Mn] [Al/Fe] abundance. Its relatively low metallicity with respect to old and moderately metal-poor inner Galaxy clusters may suggest a low-metallicity floor for globular clusters that formed in-situ in the early Galactic bulge.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

Galaxy: bulge
Galaxy: kinematics and dynamics
Globular clusters: individual: NGC 6355
Hertzsprung-Russell and C-M diagrams
Stars: Abundances
Stars: Atmospheres

Publication and Content Type

art (subject category)
ref (subject category)

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