The Gaia-ESO survey: the inner disk intermediate-age open cluster NGC 6802

DOI: 
10.1051/0004-6361/201629883
Publication date: 
01/04/2017
Main author: 
Tang, B.
IAA authors: 
Costado, M. T.
Authors: 
Tang, B.;Geisler, D.;Friel, E.;Villanova, S.;Smiljanic, R.;Casey, A. R.;Randich, S.;Magrini, L.;San Roman, I.;Muñoz, C.;Cohen, R. E.;Mauro, F.;Bragaglia, A.;Donati, P.;Tautvaišien*error*ė, G.;Drazdauskas, A.;Ženovienė, R.;Snaith, O.;Sousa, S.;Adibekyan, V.;Costado, M. T.;Blanco-Cuaresma, S.;Jiménez-Esteban, F.;Carraro, G.;Zwitter, T.;François, P.;Jofrè, P.;Sordo, R.;Gilmore, G.;Flaccomio, E.;Koposov, S.;Korn, A. J.;Lanzafame, A. C.;Pancino, E.;Bayo, A.;Damiani, F.;Franciosini, E.;Hourihane, A.;Lardo, C.;Lewis, J.;Monaco, L.;Morbidelli, L.;Prisinzano, L.;Sacco, G.;Worley, C. C.;Zaggia, S.
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
601
Pages: 
A56
Abstract: 

Milky Way open clusters are very diverse in terms of age, chemical composition, and kinematic properties. Intermediate-age and old open clusters are less common, and it is even harder to find them inside the solar Galactocentric radius, due to the high mortality rate and strong extinction inside this region. NGC 6802 is one of the inner disk open clusters (IOCs) observed by the Gaia-ESO survey (GES). This cluster is an important target for calibrating the abundances derived in the survey due to the kinematic and chemical homogeneity of the members in open clusters. Using the measurements from Gaia-ESO internal data release 4 (iDR4), we identify 95 main-sequence dwarfs as cluster members from the GIRAFFE target list, and eight giants as cluster members from the UVES target list. The dwarf cluster members have a median radial velocity of 13.6 ± 1.9 km s<SUP>-1</SUP>, while the giant cluster members have a median radial velocity of 12.0 ± 0.9 km s<SUP>-1</SUP> and a median [Fe/H] of 0.10 ± 0.02 dex. The color-magnitude diagram of these cluster members suggests an age of 0.9 ± 0.1 Gyr, with (m-M)<SUB>0</SUB> = 11.4 and E(B-V) = 0.86. We perform the first detailed chemical abundance analysis of NGC 6802, including 27 elemental species. To gain a more general picture about IOCs, the measurements of NGC 6802 are compared with those of other IOCs previously studied by GES, that is, NGC 4815, Trumpler 20, NGC 6705, and Berkeley 81. NGC 6802 shows similar C, N, Na, and Al abundances as other IOCs. These elements are compared with nucleosynthetic models as a function of cluster turn-off mass. The α, iron-peak, and neutron-capture elements are also explored in a self-consistent way. Full Tables A.3-A.6 are only available at the CDS via anonymous ftp to <A href='http://cdsarc.u-strasbg.fr'>http://cdsarc.u-strasbg.fr</A> (<A href='http://130.79.128.5'>http://130.79.128.5</A>) or via <A href='http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/601/A56'>http://cdsarc.u-s...

Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018408829&doi=10.1051%2f0004-6361%2f201629883&partnerID=40&md5=66bf69c25ffb95cf6773c07625eeb5bf
ADS Bibcode: 
2017A&A...601A..56T
Keywords: 
open clusters and associations: individual: NGC 6802;open clusters and associations: general;stars: abundances;Astrophysics - Astrophysics of Galaxies;Astrophysics - Solar and Stellar Astrophysics