NDLI: The Gaia-ESO Survey: Insights into the inner-disc evolution from open clusters

Content Provider	EDP Sciences
Author	L. Magrini S. Randich P. Donati A. Bragaglia V. Adibekyan D. Romano R. Smiljanic S. Blanco-Cuaresma G. Tautvaišienė E. Friel J. Overbeek H. Jacobson T. Cantat-Gaudin A. Vallenari R. Sordo E. Pancino D. Geisler I. San Roman S. Villanova A. Casey A. Hourihane C. C. Worley P. Francois G. Gilmore T. Bensby E. Flaccomio A. J. Korn A. Recio-Blanco G. Carraro M. T. Costado E. Franciosini U. Heiter P. Jofré C. Lardo P. de Laverny L. Monaco L. Morbidelli G. Sacco S. G. Sousa S. Zaggia
Abstract	Context. The inner disc, which links the thin disc with the bulge, has been somewhat neglected in the past because of the intrinsic difficulties in its study, among which crowding and high extinction. Open clusters located in the inner disc are among thebest tracers of its chemistry at different ages and distances. Aims. We analyse the chemical patterns of four open clusters located within 7 kpc of the Galactic centre and of field stars to infer the properties of the inner disc with the Gaia-ESO survey idr2/3 data release. Methods. We derive the parameters of the newly observed cluster, Berkeley 81, finding an age of about 1 Gyr and a Galactocentric distance of ~5.4 kpc. We construct the chemical patterns of clusters and we compare them with those of field stars in the solar neighbourhood and in the inner-disc samples. Results. Comparing the three populations we observe that inner-disc clusters and field stars are both, on average, enhanced in [O/Fe], [Mg/Fe], and [Si/Fe]. Using the idr2/3 results of M67, we estimate the non-local thermodynamic equilibrium (NLTE) effect on the abundances of Mg and Si in giant stars. After empirically correcting for NLTE effects, we note that NGC 6705 and Be 81 still have a high [α/Fe]. Conclusions. The location of the four open clusters and of the field population reveals that the evolution of the metallicity [Fe/H] and of [α/Fe] can be explained within the framework of a simple chemical evolution model: both [Fe/H] and [α/Fe] of Trumpler 20 and of NGC 4815 are in agreement with expectations from a simple chemical evolution model. On the other hand, NGC 6705, and to a lesser degree Berkeley 81, have higher [α/Fe] than expected for their ages, location in the disc, and metallicity. These differences might originate from local enrichment processes as explained in the inhomogeneous evolution framework.
Page Count	15
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2015/08/aa26305-15/aa26305-15.html
e-ISSN	14320746
Journal	Astronomy & Astrophysics
Volume Number	580
DOI	10.1051/0004-6361/201526305
Language	English
Publisher	EDP Sciences
Publisher Date	2015-08-01
Access Restriction	Open
Rights Holder	© ESO, 2015
Subject Keyword	Galaxy: abundances open clusters and associations: general open clusters and associations: individual: Trumpler 20 Galaxy: disk open clusters and associations: individual: NGC 6705 globular clusters: individual: NGC 4815 Galaxy: abundances / open clusters and associations: general / open clusters and associations: individual: Trumpler 20 / Galaxy: disk / open clusters and associations: individual: NGC 6705 / globular clusters: individual: NGC 4815
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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The Gaia-ESO Survey: Abundance ratios in the inner-disk open clusters Trumpler 20, NGC 4815, NGC 6705

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