2012MNRAS.422.3527M

Query : 2012MNRAS.422.3527M

2012MNRAS.422.3527M - Mon. Not. R. Astron. Soc., 422, 3527-3534 (2012/June-1)

Elemental abundances of intermediate-age open cluster NGC 3680.

MITSCHANG A.W., DE SILVA G.M. and ZUCKER D.B.

Abstract (from CDS):

We present a new abundance analysis of the intermediate-age Galactic open cluster NGC 3680, based on high-resolution, high signal-to-noise ratio VLT/UVES spectroscopic data. Several element abundances are presented for this cluster for the first time, but most notably we derive abundances for the light and heavy s-process elements Y, Ba, La and Nd. The serendipitous measurement of the rare-earth r-process element Gd is also reported. This cluster exhibits a significant enhancement of Na in giants as compared to dwarfs, which may be a proxy for an O to Na anticorrelation as observed in Galactic globular clusters but not open clusters. We also observe a step-like enhancement of heavy s-process elements towards higher atomic number, contrary to expectations from asymptotic giant branch nucleosynthesis models, suggesting that the r process played a significant role in the generation of both La and Nd in this cluster.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: abundances - open clusters and associations: general - open clusters and associations: individual: NGC 3680

VizieR on-line data: <Available at CDS (J/MNRAS/422/3527): table1.dat table2.dat>

Simbad objects: 18

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Number of rows : 18
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 2141 OpC 06 02 56.5 +10 26 57           ~ 159 0
2 Cl Haffner 2 OpC 07 03 06.2 -20 49 07           ~ 146 0
3 NGC 2420 OpC 07 38 24.6 +21 34 26   9.0 8.3     ~ 523 0
4 CD-42 6963 * 11 25 16.1744004384 -43 14 24.079251516   11.93 10.78     ~ 50 0
5 NGC 3680 5 * 11 25 18.4752370488 -43 16 24.785019624   13.35 12.86     ~ 25 0
6 NGC 3680 OpC 11 25 19.8 -43 14 38   8.40 7.6     ~ 340 0
7 CD-42 6971 * 11 25 26.2329251328 -43 11 23.989609392   11.18 10.17     G5III 46 0
8 CD-42 6974 * 11 25 29.2495299072 -43 15 47.797382124   12.01 10.94     ~ 35 0
9 NGC 3680 24 * 11 25 34.3432925328 -43 15 21.449527740   14.48 13.92     ~ 18 0
10 CD-42 6977 * 11 25 38.0643019800 -43 16 06.379106556   12.1 10.8     ~ 45 0
11 NGC 3680 35 * 11 25 38.1499544496 -43 13 27.167971548   13.67 13.17     ~ 24 0
12 CD-42 6976 MS* 11 25 38.6652469728 -43 13 58.792503612   11.56 10.69     G0V 41 0
13 CD-42 6978 SB* 11 25 41.9407631736 -43 17 06.905574420   11.93 10.78     ~ 51 0
14 CD-42 6981 * 11 25 48.5315765064 -43 09 52.530808176   12.043 10.886 10.08 9.829 ~ 65 0
15 CD-42 6983 * 11 25 49.9058331792 -43 12 15.712705908   11.3 10.02     K0III 43 0
16 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 920 0
17 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
18 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0

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