2015MNRAS.446.3556M

Query : 2015MNRAS.446.3556M

2015MNRAS.446.3556M - Mon. Not. R. Astron. Soc., 446, 3556-3561 (2015/February-1)

O, Na, Ba and Eu abundance patterns in open clusters.

MacLEAN B.T., DE SILVA G.M. and LATTANZIO J.

Abstract (from CDS):

Open clusters are historically regarded as single-aged stellar populations representative of star formation within the Galactic disc. Recent literature has questioned this view, based on discrepant Na abundances relative to the field, and concerns about the longevity of bound clusters contributing to a selection bias: perhaps long-lived open clusters are chemically different to the star formation events that contributed to the Galactic disc. We explore a large sample of high-resolution Na, O, Ba and Eu abundances from the literature, homogenized as much as reasonable including accounting for non-local thermodynamic equilibrium (NLTE) effects, variations in analysis and choice of spectral lines. Compared to a template globular cluster and representative field stars, we find no significant abundance trends, confirming that the process producing the Na-O anticorrelation in globular clusters is not present in open clusters. Furthermore, previously reported Na enhancement of open clusters is found to be an artefact of NLTE effects, with the open clusters matching a subset of chemically tagged field stars.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

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

VizieR on-line data: <Available at CDS (J/MNRAS/446/3556): clusters.dat table2.dat refs.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

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 - 2026 		#notes
1 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
2 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
3 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
4 NGC 1817 OpC 05 12 33.9 +16 41 34           ~ 210 0
5 NGC 2360 OpC 07 17 45.8 -15 38 21           ~ 213 0
6 Cl Berkeley 39 OpC 07 46 48.1 -04 39 59           ~ 209 1
7 NGC 2506 OpC 08 00 02.3 -10 46 22   8.28 7.6     ~ 313 0
8 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
9 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
10 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
11 NGC 3114 OpC 10 01 55.0 -60 02 16   4.47 4.2     ~ 213 0
12 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
13 Cl Collinder 261 OpC 12 38 04.7 -68 22 40     10.7     ~ 216 0
14 Cl Ruprecht 106 GlC 12 38 40.20 -51 09 01.0           ~ 413 0
15 Cl Trumpler 20 OpC 12 39 33.0 -60 38 10           ~ 138 0
16 NGC 6134 OpC 16 27 48.5 -49 09 40   7.89 7.2     ~ 166 0
17 NGC 6253 OpC 16 59 06.4 -52 42 39     10.2     ~ 209 0
18 IC 4651 OpC 17 24 48.5 -49 55 23           ~ 374 0
19 NGC 6475 OpC 17 53 44.1 -34 49 36           ~ 413 0
20 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
21 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
22 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0
23 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0

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