Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...523a..11m&link_type=abstract
Astronomy and Astrophysics, Volume 523, id.A11
Astronomy and Astrophysics
Astrophysics
7
Galaxy: Abundances, Galaxy: Evolution, Open Clusters And Associations: Individual: Ngc 6192, Open Clusters And Associations: Individual: Ngc 6404, Open Clusters And Associations: Individual: Ngc 6583
Scientific paper
Context. In the framework of the study of the Galactic metallicity gradient and its time evolution, we present new high-resolution spectroscopic observations obtained with FLAMES and the fiber link to UVES at VLT of three open clusters (OCs) located within ~7 kpc from the Galactic centre (GC): NGC 6192, NGC 6404, NGC 6583. We also present new orbit determination for all OCs with Galactocentric distances (RGC) ≤ 8 kpc and metallicity from high-resolution spectroscopy. Aims: We aim to investigate the slope of the inner disc metallicity gradient as traced by OCs and to discuss its implication for the chemical evolution of our Galaxy. Methods: We have derived memberships of a group of evolved stars for each clusters, obtaining a sample of 4, 4, and 2 member stars in NGC 6192, NGC 6404, and NGC 6583, respectively. Using standard LTE analysis we derived stellar parameters and abundance ratios for the iron-peak elements Fe, Ni, Cr, and for the α-elements Al, Mg, Si, Ti, Ca. We calculated the orbits of the OCs currently located within 8 kpc from the GC, and discuss their implication on the present-time radial location. Results: The average metallicities of the three clusters are all oversolar: [Fe/H] = + 0.12 ± 0.04 (NGC 6192), + 0.11 ± 0.04 (NGC 6404), + 0.37 ± 0.03 (NGC 6583). They are in qualitative agreement with their Galactocentric distances, because they are all internal OCs, and expected to be more metal rich than the solar neighbourhood. The abundance ratios of the other elements over iron [X/Fe] are consistent with solar values. Conclusions: The clusters we have analysed confirm, together with other OC and Cepheid data, a steep gradient in the inner disc, a signature of an evolutionary rate that is different from the one in the outer disc.
Based on observations obtained at the ESO Based on spectroscopic optical observations made with ESO telescope VLT, program: ID: 083.D-0682, Title: The Galactic radial metallicity gradient in the inner disc.Tables A.1 to A.4 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/523/A11
Busso Maurizio
Carraro Giovanni
Galli Daniele
Jilkova Lucie
Magrini Laura
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