2018A&A...617A.106M


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST22:03:09

2018A&A...617A.106M - Astronomy and Astrophysics, volume 617A, 106-106 (2018/9-1)

The Gaia-ESO Survey: the origin and evolution of s-process elements.

MAGRINI L., SPINA L., RANDICH S., FRIEL E., KORDOPATIS G., WORLEY C., PANCINO E., BRAGAGLIA A., DONATI P., TAUTVAISIENE G., BAGDONAS V., DELGADO-MENA E., ADIBEKYAN V., SOUSA S.G., JIMENEZ-ESTEBAN F.M., SANNA N., ROCCATAGLIATA V., BONITO R., SBORDONE L., DUFFAU S., GILMORE G., FELTZING S., JEFFRIES R.D., VALLENARI A., ALFARO E.J., BENSBY T., FRANCOIS P., KOPOSOV S., KORN A.J., RECIO-BLANCO A., SMILJANIC R., BAYO A., CARRARO G., CASEY A.R., COSTADO M.T., DAMIANI F., FRANCIOSINI E., FRASCA A., HOURIHANE A., JOFRE P., DE LAVERNY P., LEWIS J., MASSERON T., MONACO L., MORBIDELLI L., PRISINZANO L., SACCO G. and ZAGGIA S.

Abstract (from CDS):


Context. Several works have found an increase of the abundances of the s-process neutron-capture elements in the youngest Galactic stellar populations. These trends provide important constraints on stellar and Galactic evolution and they need to be confirmed with large and statistically significant samples of stars spanning wide age and distance intervals.
Aims. We aim to trace the abundance patterns and the time evolution of five s-process elements - two belonging to the first peak, Y and Zr, and three belonging to the second peak, Ba, La, and Ce - using the Gaia-ESOIDR5 results for open clusters and disc stars.
Methods. From the UVES spectra of cluster member stars, we determined the average composition of clusters with ages >0.1Gyr. We derived statistical ages and distances of field stars, and we separated them into thin and thick disc populations. We studied the time-evolution and dependence on metallicity of abundance ratios using open clusters and field stars whose parameters and abundances were derived in a homogeneous way.
Results. Using our large and homogeneous sample of open clusters, thin and thick disc stars, spanning an age range larger than 10Gyr, we confirm an increase towards young ages of s-process abundances in the solar neighbourhood. These trends are well defined for open clusters and stars located nearby the solar position and they may be explained by a late enrichment due to significant contribution to the production of these elements from long-living low-mass stars. At the same time, we find a strong dependence of the s-process abundance ratios on the Galactocentric distance and on the metallicity of the clusters and field stars.
Conclusions. Our results, derived from the largest and most homogeneous sample of s-process abundances in the literature, confirm the growth with decreasing stellar ages of the s-process abundances in both field and open cluster stars. At the same time, taking advantage of the abundances of open clusters located in a wide Galactocentric range, these results offer a new perspective on the dependence of the s-process evolution on the metallicity and star formation history, pointing to different behaviours at various Galactocentric distances.

Abstract Copyright: © ESO 2018

Journal keyword(s): Galaxy: abundances - open clusters and associations: general - Galaxy: disk

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 2243 OpC 06 29 34 -31 17.0   10.12 9.4     ~ 210 0
2 Cl Berkeley 25 OpC 06 41 16 -16 29.2           ~ 44 0
3 Cl Berkeley 31 OpC 06 57 36 +08 16.0           ~ 94 0
4 Cl Berkeley 36 OpC 07 16 23 -13 11.8           ~ 18 0
5 Cl Melotte 71 OpC 07 37 34 -12 03.3   7.44 7.1     ~ 94 0
6 NGC 2420 OpC 07 38 23 +21 34.4   9.0 8.3     ~ 400 0
7 2MASS J07382696+2133313 SB* 07 38 26.9653366142 +21 33 31.299112726   12.66 11.76     ~ 30 0
8 NGC 2516 OpC 07 58 04 -60 45.2           ~ 590 0
9 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2037 0
10 NGC 3532 OpC 11 05 39 -58 45.2           ~ 266 0
11 Cl Trumpler 20 OpC 12 39 45 -60 38.1     10.1     ~ 71 0
12 NGC 4815 OpC 12 58 01 -64 57.6   9.61 8.6     ~ 68 0
13 Cl Pismis 18 OpC 13 36 56 -62 03.9   10.30 9.7     ~ 34 0
14 NGC 6005 OpC 15 55 59 -57 26.4   11.90 10.7     ~ 32 0
15 Cl Trumpler 23 OpC 16 00 52 -53 32.0     11.2     ~ 26 0
16 NGC 6067 OpC 16 13 11 -54 13.1           ~ 169 0
17 NGC 6259 OpC 17 00 45 -44 39.3   8.85 8.0     ~ 54 0
18 C 1749-295 OpC 17 52 43 -29 33.0           ~ 15 0
19 NGC 6633 OpC 18 27 31.2 +06 34 12           ~ 323 0
20 NGC 6705 OpC 18 51 05 -06 16.2   6.32 5.8     ~ 354 0
21 Cl Berkeley 81 OpC 19 01 37 -00 27.6           ~ 48 0
22 Cl Berkeley 44 OpC 19 17 18.0 +19 32 27           ~ 24 0
23 NGC 6802 OpC 19 30 36.0 +20 15 34   10.07 8.8     ~ 75 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-22:03:09

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