2006A&A...458..121S

Query : 2006A&A...458..121S

2006A&A...458..121S - Astronomy and Astrophysics, volume 458, 121-134 (2006/10-4)

Old open clusters as key tracers of Galactic chemical evolution. I. Fe abundances in NGC 2660, NGC 3960, and Berkeley 32.

SESTITO P., BRAGAGLIA A., RANDICH S., CARRETTA E., PRISINZANO L. and TOSI M.

Abstract (from CDS):

We obtained high-resolution UVES/FLAMES observations of a sample of nine old open clusters spanning a wide range of ages and Galactocentric radii. The goal of the project is to investigate the radial metallicity gradient in the disk, as well as the abundance of key elements (α and Fe-peak elements). In this paper we present the results for the metallicity of three clusters: NGC 2660 (age ∼1Gyr, Galactocentric distance of 8.68kpc), NGC 3960 (∼1Gyr, 7.80kpc), and Be 32 (∼6-7Gyr, 11.30kpc). For Be 32 and NGC 2660, our study provides the first metallicity determination based on high-resolution spectra. We performed equivalent width analysis with the spectral code MOOG, which allows us to define a metallicity scale and build a homogeneous sample. We find that NGC 3960 and NGC 2660 have a metallicity that is very close to solar ([Fe/H]=+0.02 and +0.04, respectively), while the older Be 32 turns out to have [Fe/H]=-0.29.

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Journal keyword(s): stars: abundances - stars: evolution - Galaxy: disk - open clusters and associations: individual: NGC 2660 - open clusters and associations: individual: NGC 3960 - open clusters and associations: individual: Berkeley 32

Nomenclature: Table 3, col(1): Cl* NGC 3960 SBR cN (Nos c1 to c9). Table 5, col(1): Cl* Berkeley 32 SBR NNN N=10 among (Nos 17-941).

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 * gam Tau ** 04 19 47.6039239005 +15 37 39.511385129 5.46 4.64 3.65 4.83   G9.5IIIabCN0.5 549 0
2 * del Tau SB* 04 22 56.0951595936 +17 32 33.049802364 5.56 4.74 3.76 5.56   G9.5IIICN0.5 525 0
3 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3074 0
4 Cl Berkeley 20 OpC 05 32 36.5 +00 11 06           ~ 120 0
5 Cl Berkeley 29 OpC 06 53 04.2 +16 55 39   14.3       ~ 174 0
6 Cl* Berkeley 32 DBT 99 HB* 06 57 50.5647416841 +06 26 11.936287231   14.769 13.696   12.477 ~ 22 0
7 Cl* Berkeley 32 DBT 121 * 06 57 59.8110311326 +06 26 59.894034677 16.261 15.387 14.242   13.028 ~ 17 0
8 Cl* Berkeley 32 DBT 1183 * 06 58 01.7622102816 +06 29 55.299796512   14.450 13.425   12.322 ~ 5 0
9 Cl* Berkeley 32 KM 27 RG* 06 58 02.2532836368 +06 24 56.655180000 16.388 15.504 14.384   13.177 ~ 22 0
10 Cl* Berkeley 32 DBT 787 HB* 06 58 03.0802810656 +06 26 16.046291472 15.578 14.797 13.722   12.582 ~ 19 0
11 Cl Berkeley 32 OpC 06 58 07.2 +06 25 59           ~ 145 0
12 Cl* Berkeley 32 RS 1866 RG* 06 58 07.4644077336 +06 29 32.680290840 16.977 16.314 15.306   14.165 ~ 20 0
13 Cl* Berkeley 32 KM 17 HB* 06 58 08.2327053216 +06 24 19.416522240 15.542 14.756 13.685   12.540 ~ 23 0
14 Cl* Berkeley 32 SBR 938 * 06 58 11.4805266731 +06 21 16.177443258     13.672   12.501 ~ 13 0
15 Cl* Berkeley 32 KM 18 HB* 06 58 13.7544484904 +06 27 54.868937734 15.536 14.768 13.713   12.550 ~ 26 0
16 Cl* Berkeley 32 SBR 940 HB* 06 58 22.8994656440 +06 26 25.286745982   14.793 13.691   12.548 ~ 21 0
17 NGC 2324 OpC 07 04 07.9 +01 02 46   8.83 8.4     ~ 159 0
18 NGC 2477 OpC 07 52 11.0 -38 32 13   6.64 5.8     ~ 290 0
19 Cl* NGC 2660 SBT 296 RB? 08 42 36.4272537240 -47 12 07.495126164   15.798 14.552   13.174 ~ 15 0
20 Cl* NGC 2660 SBT 318 RB? 08 42 36.7085622912 -47 10 37.296498756   15.401 14.110   12.713 ~ 11 0
21 NGC 2660 OpC 08 42 40.1 -47 12 04   9.05 8.8     ~ 152 0
22 Cl* NGC 2660 SBT 542 RB? 08 42 41.7185926800 -47 11 25.454997060   15.420 14.120   12.704 ~ 15 0
23 Cl* NGC 2660 SBT 694 RB? 08 42 45.4330931736 -47 11 18.916370232   15.674 14.368   12.938 ~ 15 0
24 Cl* NGC 2660 SBT 862 RB? 08 42 50.6657557584 -47 13 03.817737264   15.602 14.315   12.909 ~ 15 0
25 ESO 435-20 EmG 09 59 21.226 -28 08 00.04   14.42 14.08 13.33   ~ 81 2
26 Cl* NGC 3960 PMS 310753 * 11 50 06.3436179648 -55 44 13.095449340   15.866 14.262   12.496 ~ 2 0
27 Cl* NGC 3960 PMS 310758 ? 11 50 26.750 -55 40 28.20   14.084 12.945   11.697 ~ 8 0
28 Cl* NGC 3960 PMS 310756 ? 11 50 28.184 -55 41 36.66   14.366 13.194   11.907 ~ 8 0
29 Cl* NGC 3960 PMS 310755 ? 11 50 33.149 -55 42 36.13   14.799 13.514   12.088 ~ 4 0
30 NGC 3960 OpC 11 50 34.6 -55 40 44   9.07 8.3     ~ 140 0
31 Cl* NGC 3960 PMS 310757 ? 11 50 36.050 -55 42 05.40   14.323 13.062   11.679 ~ 5 0
32 Cl* NGC 3960 PMS 310760 ? 11 50 37.621 -55 40 15.19   14.224 13.060   11.758 ~ 5 0
33 Cl* NGC 3960 PMS 310761 ? 11 50 38.100 -55 39 44.50   14.309 13.100   11.787 ~ 8 0
34 NGC 6253 OpC 16 59 06.7 -52 42 43     10.2     ~ 186 0
35 NGC 6791 OpC 19 20 53.0 +37 46 41   10.52 9.5     ~ 1040 0

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