2009A&A...500L..25D


Query : 2009A&A...500L..25D

2009A&A...500L..25D - Astronomy and Astrophysics, volume 500, L25-28 (2009/6-3)

O and Na abundance patterns in open clusters of the galactic disk.

DE SILVA G.M., GIBSON B.K., LATTANZIO J. and ASPLUND M.

Abstract (from CDS):

A global O-Na abundance anti-correlation is observed in globular clusters, which is not present in the Galactic field population. Open clusters are thought to be chemically homogeneous internally. We aim to explore the O and Na abundance pattern among the open cluster population of the Galactic disk. We combine open cluster abundance ratios of O and Na from high-resolution spectroscopic studies in the literature and normalize them to a common solar scale. We compare the open cluster abundances against the globular clusters and disk field. We find that the different environments show different abundance patterns. The open clusters do not show the O-Na anti-correlation at the extreme O-depletion/Na-enhancement as observed in globular clusters. Furthermore, the high Na abundances in open clusters do not match the disk field stars. If real, it may be suggesting that the dissolution of present-day open clusters is not a significant contribution to building the Galactic disk. Large-scale homogeneous studies of clusters and field will further confirm the reality of the Na enhancement.

Abstract Copyright:

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

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1330 0
2 Cl Berkeley 17 OpC 05 20 31 +30 34.4           ~ 151 0
3 Cl Berkeley 20 OpC 05 32 36 +00 11.1           ~ 106 0
4 NGC 2112 OpC 05 53 48 +00 24.2     9.1     ~ 76 0
5 NGC 2141 OpC 06 02 56 +10 27.1   10.43 9.4     ~ 125 0
6 NGC 2243 OpC 06 29 35 -31 16.9   10.12 9.4     ~ 241 0
7 Cl Berkeley 29 OpC 06 53 04.2 +16 55 39   14.3       ~ 153 0
8 Cl Berkeley 31 OpC 06 57 37 +08 17.1           ~ 105 0
9 Cl Melotte 66 OpC 07 26 18 -47 41.1   8.73 7.8     ~ 184 0
10 Cl Melotte 71 OpC 07 37 32 -12 03.9   7.44 7.1     ~ 105 0
11 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1384 0
12 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2173 0
13 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1332 0
14 NGC 3680 OpC 11 25 34 -43 14.4   8.40 7.6     ~ 298 0
15 Cl Collinder 261 OpC 12 38 05 -68 22.6     10.7     ~ 171 0
16 IC 4561 GiG 15 36 47.0623511736 +25 25 00.450377616   15.2       ~ 19 0
17 NGC 6253 OpC 16 59 07 -52 42.7     10.2     ~ 165 0
18 NGC 6791 OpC 19 20 53 +37 46.7   10.52 9.5     ~ 956 0
19 NGC 6939 OpC 20 31 40 +60 39.2   8.85 7.8     ~ 145 0
20 NGC 7142 OpC 21 45 10.0 +65 46 18   10.36 9.3     ~ 128 0
21 NGC 7789 OpC 23 57 20 +56 43.6   7.68 6.7     ~ 481 0

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2022.05.25-00:41:46

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