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The Gaia-ESO Survey: Probes of the inner disk abundance gradient
MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA..
Indiana Univ, Dept Astron, Bloomington, IN 47405 USA..
Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands..
Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy..
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2016 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 591, A37Article in journal (Refereed) PublishedText
Abstract [en]

Context. The nature of the metallicity gradient inside the solar circle (R-GC < 8 kpc) is poorly understood, but studies of Cepheids and a small sample of open clusters suggest that it steepens in the inner disk. Aims. We investigate the metallicity gradient of the inner disk using a sample of inner disk open clusters that is three times larger than has previously been studied in the literature to better characterize the gradient in this part of the disk. Methods. We used the Gaia-ESO Survey (GES) [Fe/H] values and stellar parameters for stars in 12 open clusters in the inner disk from GES-UVES data. Cluster mean [Fe/H] values were determined based on a membership analysis for each cluster. Where necessary, distances and ages to clusters were determined via comparison to theoretical isochrones. Results. The GES open clusters exhibit a radial metallicity gradient of -0.10 +/- 0.02 dex kpc(-1), consistent with the gradient measured by other literature studies of field red giant stars and open clusters in the range R-GC similar to 6-12 kpc. We also measure a trend of increasing [Fe/H] with increasing cluster age, as has also been found in the literature. Conclusions. We find no evidence for a steepening of the inner disk metallicity gradient inside the solar circle as earlier studies indicated. The age-metallicity relation shown by the clusters is consistent with that predicted by chemical evolution models that include the effects of radial migration, but a more detailed comparison between cluster observations and models would be premature.

Place, publisher, year, edition, pages
2016. Vol. 591, A37
Keyword [en]
Galaxy: formation, Galaxy: disk, Galaxy: abundances, stars: abundances
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-300472DOI: 10.1051/0004-6361/201527654ISI: 000379141300046OAI: oai:DiVA.org:uu-300472DiVA: diva2:951435
Funder
EU, FP7, Seventh Framework Programme, 320360;313146EU, European Research CouncilSwedish National Space Board
Available from: 2016-08-09 Created: 2016-08-09 Last updated: 2016-08-09Bibliographically approved

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