2015MNRAS.446.3319Y

Query : 2015MNRAS.446.3319Y

2015MNRAS.446.3319Y - Mon. Not. R. Astron. Soc., 446, 3319-3329 (2015/February-1)

CNO abundances in the globular clusters NGC 1851 and NGC 6752.

YONG D., GRUNDAHL F. and NORRIS J.E.

Abstract (from CDS):

We measure the C+N+O abundance sum in red giant stars in two Galactic globular clusters, NGC 1851 and NGC 6752. NGC 1851 has a split subgiant branch which could be due to different ages or C+N+O content while NGC 6752 is representative of the least complex globular clusters. For NGC 1851 and NGC 6752, we obtain average values of A(C+N+O) = 8.16±0.10 (σ = 0.34) and 7.62±0.02 (σ = 0.06), respectively. When taking into account the measurement errors, we find a constant C+N+O abundance sum in NGC 6752. The C+N+O abundance dispersion is only 0.06 dex, and such a result requires that the source of the light element abundance variations does not increase the C+N+O sum in this cluster. For NGC 1851, we confirm a large spread in C+N+O. In this cluster, the anomalous RGB has a higher C+N+O content than the canonical RGB by a factor of 4 ( ∼ 0.6 dex). This result lends further support to the idea that the two subgiant branches in NGC 1851 are roughly coeval, but with different CNO abundances.

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 - globular clusters: individual: NGC 1851 - globular clusters: individual: NGC 6752

VizieR on-line data: <Available at CDS (J/MNRAS/446/3319): table2.dat table4.dat>

Nomenclature: Table 2: [YGN2015] NGC1851 NR NNNN N=15 among (Nos 712-8066).

CDS comments: In table 1: B NNN = Cl* NGC 6752 BUON NNNN ; NGC 6752-NN = Cl* NGC 6752 YGN NN in SIMBAD.

Simbad objects: 40

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Number of rows : 40
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 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 Cl* NGC 1851 STET 319 RG* 05 13 50.3057991600 -40 02 07.130997528   15.974 14.862     ~ 13 0
3 Cl* NGC 1851 PML 5 RG* 05 13 59.4624496728 -40 05 22.727758884   15.82 14.70     ~ 12 0
4 2MASS J05140132-4002058 LP* 05 14 01.3390125663 -40 02 05.985532141     13.37     ~ 8 0
5 UCAC4 250-006248 RG* 05 14 02.8174108705 -40 01 22.954004004   15.025 13.533 13.131   ~ 9 0
6 2MASS J05140585-4003245 RG* 05 14 05.8640761536 -40 03 24.734841372     13.75     ~ 5 0
7 2MASS J05140659-4002026 AB* 05 14 06.597 -40 02 02.63   15.82 14.78     ~ 2 0
8 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
9 2MASS J05140778-4001181 RG* 05 14 07.7881301808 -40 01 18.299408880   15.829 14.793     ~ 10 0
10 2MASS J05141034-4004235 AB* 05 14 10.3471686888 -40 04 23.736673596   15.74 14.76     ~ 2 0
11 2MASS J05141035-3958148 AB* 05 14 10.3671877968 -39 58 14.922789132   15.76 14.72     ~ 6 0
12 2MASS J05141351-4003408 AB* 05 14 13.5265064208 -40 03 41.080220280   15.83 14.87     ~ 2 0
13 Cl* NGC 1851 STET 58 RG* 05 14 14.4808541952 -40 01 10.941358152   15.525 14.317 14.358   ~ 16 0
14 2MASS J05141501-4003040 AB* 05 14 15.0301711584 -40 03 04.061705508   15.82 14.85     ~ 4 0
15 Cl* NGC 1851 WALK 1256 RG* 05 14 17.2542670800 -40 02 08.020386420   15.531 14.375     ~ 10 0
16 Cl* NGC 1851 STET 168 RG* 05 14 19.3509988632 -40 04 23.824360992   15.02 13.30     ~ 17 0
17 Cl* NGC 1851 STET 112 RG* 05 14 25.9737762168 -40 02 53.762852868   15.352 13.813 13.551   ~ 15 0
18 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
19 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
20 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
21 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
22 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
23 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
24 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
25 Cl* NGC 6752 BUON 4446 RG* 19 10 14.9559748296 -59 59 13.414731468   14.59 13.78     ~ 15 0
26 NGC 6752 67 RG* 19 10 25.9459355640 -59 59 05.050889808   14.38 13.59     ~ 18 0
27 Cl* NGC 6752 YGN 6 * 19 10 34.3616645352 -59 59 55.028925744   14.43 13.40     ~ 9 0
28 NGC 6752 57 RG* 19 10 36.4928689368 -59 56 07.703392560   14.62 14.00     ~ 18 0
29 Cl* NGC 6752 CBG 14537 RG* 19 10 43.8200177558 -59 59 41.502972220   14.913 14.135     ~ 17 0
30 Cl* NGC 6752 BUON 3103 * 19 10 45 -59 58.3     13.56     ~ 7 0
31 Cl* NGC 6752 YGN 1 * 19 10 47 -60 00.7     13.27     ~ 6 0
32 NGC 6752 5 RG* 19 10 48.6380923344 -60 01 55.414478928   14.402 13.743 13.633   ~ 18 0
33 Cl* NGC 6752 BUON 2728 RG* 19 10 49.9412104080 -60 02 25.640269368   14.528 13.697     ~ 13 0
34 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
35 NGC 6752 28 RG* 19 11 11.1684637896 -60 00 16.942232952   14.07 13.33     ~ 19 0
36 NGC 6752 37 RG* 19 11 11.6425951848 -59 58 28.749173376   14.89 14.08     ~ 21 0
37 NGC 6752 17 RG* 19 11 13.4059513224 -60 02 30.244768548   14.85 14.06     ~ 20 0
38 Cl* NGC 6752 BUON 1113 RG* 19 11 23.1147114120 -59 59 39.720399864   14.815 14.002     ~ 19 0
39 Cl* NGC 6752 YGN 4 RG* 19 11 32.6634739224 -60 00 02.105715024   14.322 13.491     ~ 18 0
40 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1

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