2016ApJ...824...75O

Query : 2016ApJ...824...75O

2016ApJ...824...75O - Astrophys. J., 824, 75-75 (2016/June-3)

New neutron-capture measurements in 23 open clusters. I the r-process.

OVERBEEK J.C., FRIEL E.D. and JACOBSON H.R.

Abstract (from CDS):

Neutron-capture elements, those with Z > 35, are the least well understood in terms of nucleosynthesis and formation environments. The rapid neutron-capture, or r-process, elements are formed in the environments and/or remnants of massive stars, while the slow neutron-capture, or s-process, elements are primarily formed in low-mass AGB stars. These elements can provide much information about Galactic star formation and enrichment, but observational data are limited. We have assembled a sample of 68 stars in 23 open clusters that we use to probe abundance trends for six neutron-capture elements (Eu, Gd, Dy, Mo, Pr, and Nd) with cluster age and location in the disk of the Galaxy. In order to keep our analysis as homogeneous as possible, we use an automated synthesis fitting program, which also enables us to measure multiple (3-10) lines for each element. We find that the pure r-process elements (Eu, Gd, and Dy) have positive trends with increasing cluster age, while the mixed r- and s-process elements (Mo, Pr, and Nd) have insignificant trends consistent with zero. Pr, Nd, Eu, Gd, and Dy have similar, slight (although mostly statistically significant) gradients of ∼0.04 dex kpc–1. The mixed elements also appear to have nonlinear relationships with RGC.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

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

VizieR on-line data: <Available at CDS (J/ApJ/824/75): stars.dat table1.dat table2.dat table3.dat table4.dat table6.dat table7.dat table9.dat>

Simbad objects: 103

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Number of rows : 103
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 2MASS J00422570+8516219 RG* 00 42 25.6245260520 +85 16 22.085087700 15.194 14.096 12.939 12.298 11.758 ~ 43 0
2 NGC 188 2072 SB* 00 45 51.1729912872 +85 18 08.357369796 15.098 13.79 12.48 11.706 11.099 ~ 41 0
3 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
4 NGC 188 2088 * 00 47 18.4810134984 +85 19 45.791123736 15.367 14.21 12.99 12.329 11.753 ~ 42 0
5 NGC 188 2152 SB* 00 48 59.0899386168 +85 12 29.618005680 15.734 14.746 13.634 13.014 12.487 ~ 30 0
6 NGC 1193 OpC 03 05 56.4 +44 22 58     12.6     ~ 97 0
7 Cl* NGC 1193 KAL 282 * 03 05 57.6100301736 +44 22 42.415541508 17.113 15.38 14.614 14.35   ~ 16 0
8 NGC 1245 160 * 03 14 34.0701092784 +47 14 17.106571500   15.261 13.814     ~ 11 0
9 NGC 1245 125 * 03 14 36.1850846472 +47 13 50.959472052   15.004 13.423     ~ 7 0
10 NGC 1245 10 * 03 14 39.7722203712 +47 14 40.043965344   15.515 14.144     ~ 23 0
11 NGC 1245 OpC 03 14 44.3 +47 14 06   9.16 8.4     ~ 171 0
12 NGC 1245 382 * 03 14 54.4066400712 +47 17 12.412285224   14.80 13.44     ~ 11 0
13 NGC 1817 79 HB* 05 12 10.6739122296 +16 38 31.112306268   13.54 12.443     ~ 33 0
14 2MASS J05122465+1635488 AB? 05 12 24.6514051896 +16 35 48.865173360   13.12 12.057     ~ 36 0
15 Cl* NGC 1817 MMU 1456 * 05 12 32.8315448568 +16 28 25.483886472   12.98 11.370     ~ 17 0
16 NGC 1817 OpC 05 12 33.9 +16 41 34           ~ 210 0
17 NGC 1817 206 HB* 05 13 01.8086712600 +16 41 14.366465556     11.749     ~ 25 0
18 2MASS J05202386+3037219 RG* 05 20 23.8729785434 +30 37 21.947589830     14.93     ~ 28 0
19 Cl Berkeley 17 OpC 05 20 30.5 +30 34 20           ~ 192 0
20 2MASS J05203650+3030351 RG* 05 20 36.4960362624 +30 30 35.115791832     14.09     ~ 32 0
21 Cl Berkeley 17 117 * 05 20 47.7524891532 +30 31 40.875246633     15.11     ~ 17 0
22 Cl King 22 OpC 05 22 09.7 +45 26 30           ~ 81 0
23 Cl* Berkeley 18 K 1383 * 05 22 10.6577065571 +45 28 49.379587097   16.82 15.07   13.13 ~ 13 0
24 Cl* Berkeley 18 K 1163 * 05 22 13.8292063546 +45 27 58.906193704   17.42 15.79   13.93 ~ 10 0
25 2MASS J05255167+4629353 * 05 25 51.6727541184 +46 29 35.319509412   15.03 13.25 12.6   ~ 11 0
26 2MASS J05255362+4626203 * 05 25 53.6220464915 +46 26 20.287044501   14.91 13.30 12.8   ~ 12 0
27 NGC 1883 OpC 05 25 53.9 +46 29 14     12.0     ~ 52 0
28 Cl Berkeley 21 50 RG* 05 51 42.0101508720 +21 48 49.811019588   17.578 15.873     ~ 23 0
29 Cl* Berkeley 21 TPM 51 RG* 05 51 42.0410761998 +21 48 02.814846629   17.395 15.694   13.63 ~ 20 0
30 Cl Berkeley 21 OpC 05 51 44.7 +21 48 36   12.26 11.1     ~ 130 0
31 Cl* Berkeley 22 K 414 * 05 58 25.9454400192 +07 46 11.451099523   17.636 15.762   13.738 ~ 20 0
32 Cl* Berkeley 22 K 643 * 05 58 26.9515312143 +07 45 26.149633245   16.599 14.313   11.662 ~ 17 0
33 Cl Berkeley 22 OpC 05 58 28.5 +07 45 39           ~ 96 0
34 NGC 2141 4009 RG* 06 02 50.7852271656 +10 30 28.104400296     13.27     ~ 24 0
35 NGC 2141 OpC 06 02 56.5 +10 26 57           ~ 159 0
36 NGC 2141 5013 RG* 06 03 00.0247696344 +10 32 23.492692212   15.21 13.96     ~ 18 0
37 NGC 2141 3240 RG* 06 03 01.5540518304 +10 28 34.732120512   15.13 13.33     ~ 23 0
38 NGC 2141 4025 RG* 06 03 07.5542553768 +10 26 49.217579052   15.34 14.06     ~ 18 0
39 NGC 2158 4230 RG* 06 07 14.0761740939 +24 06 54.701954722   14.887 13.138 12.70   ~ 29 0
40 NGC 2158 OpC 06 07 26.7 +24 05 53           ~ 317 0
41 NGC 2194 57 * 06 13 31.6861851768 +12 46 50.157256476   15.10 13.550     ~ 13 0
42 NGC 2194 OpC 06 13 44.8 +12 48 48   9.03 8.5     ~ 90 1
43 NGC 2194 55 * 06 13 46.9231779720 +12 48 13.457229804   15.13 13.552     ~ 12 0
44 2MASS J06573740+0815591 RG* 06 57 37.4065272875 +08 15 59.122903503           ~ 19 0
45 Cl Berkeley 31 OpC 06 57 37.5 +08 17 18           ~ 142 0
46 Cl* Berkeley 32 KM 4 RG* 06 58 03.1684176970 +06 24 22.201314297 15.471 13.817 12.324   10.773 ~ 30 0
47 Cl* Berkeley 32 KM 2 RG* 06 58 03.3899824800 +06 26 49.874402688 15.442 13.733 12.201     ~ 26 0
48 Cl Berkeley 32 OpC 06 58 06.7 +06 25 53           ~ 164 0
49 Cl* Berkeley 32 KM 16 * 06 58 06.9336729575 +06 25 56.379906875 15.393 14.670 13.611   12.478 ~ 25 0
50 Cl* Berkeley 32 KM 18 HB* 06 58 13.7544484904 +06 27 54.868937734 15.536 14.768 13.713   12.550 ~ 30 0
51 NGC 2355 668 * 07 16 52.8292246058 +13 48 35.102076843   13.285 12.150     ~ 20 0
52 NGC 2355 OpC 07 16 59.1 +13 46 09     9.7     ~ 127 0
53 Cl* NGC 2355 MMU 398 * 07 17 05.1974678904 +13 44 55.152122064   10.94 9.786     ~ 22 0
54 NGC 2355 144 * 07 17 19.8853930831 +13 46 12.684625465   12.80 12.575     ~ 21 0
55 Cl* Berkeley 39 FMP 21366 HB* 07 46 41.4376184808 -04 39 08.464628844   15.619 14.417   13.132 ~ 20 0
56 Cl* Berkeley 39 KR 5 * 07 46 47.6010941496 -04 39 56.256954948   15.286 13.995   12.500 ~ 25 0
57 Cl Berkeley 39 OpC 07 46 48.1 -04 39 59           ~ 209 1
58 Cl* Berkeley 39 KUBVI 1139 HB* 07 46 54.1492528272 -04 38 58.224033096   15.489 14.359   13.113 ~ 24 0
59 NGC 2682 105 RG* 08 51 17.0998188072 +11 48 16.173832932   11.554 10.316 9.942 9.07 K2III 167 0
60 NGC 2682 141 HB* 08 51 22.8036640800 +11 48 01.779545736   11.570 10.346 10.180 9.40 K0IIIb 167 0
61 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
62 BD+12 1926 RG* 08 51 29.9058258360 +11 47 16.870629444   11.004 9.555 9.360 8.36 K3III 155 0
63 NGC 3680 OpC 11 25 19.8 -43 14 38   8.40 7.6     ~ 340 0
64 Cl Collinder 261 OpC 12 38 04.7 -68 22 40     10.7     ~ 216 0
65 Cl* Collinder 261 PJM 1080 * 12 38 07.2702295824 -68 22 31.010100492   15.387 13.952   12.472 ~ 27 0
66 Cl* Collinder 261 PJM 1045 * 12 38 08.3563836912 -68 21 15.217054596   15.034 13.547   12.017 ~ 22 0
67 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
68 Cl* NGC 6192 MMU 137 ** 16 40 11.4165638760 -43 24 00.783486792   12.981 11.223   9.465 G9III 18 0
69 Cl* NGC 6192 MMU 96 SB* 16 40 16.4599958160 -43 22 37.610042628   12.808 11.306   9.804 G2III 19 0
70 NGC 6192 96 * 16 40 18.3907513440 -43 25 46.544364732     14.063     ~ 6 0
71 NGC 6192 9 * 16 40 18.4237400472 -43 23 14.376726096   13.26 12.67     ~ 6 0
72 NGC 6192 OpC 16 40 18.7 -43 21 16           ~ 99 0
73 NGC 6192 45 * 16 40 18.7468944960 -43 24 57.947876316     14.222     ~ 5 0
74 CD-43 10987 * 16 40 24.2111991864 -43 20 07.892426724   13.288 11.743   10.197 ~ 19 0
75 CD-43 10991 * 16 40 40.8092588616 -43 22 59.428693452   12.93 11.40   9.92 ~ 18 0
76 NGC 6253 OpC 16 59 06.4 -52 42 39     10.2     ~ 209 0
77 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
78 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
79 NGC 6939 53 * 20 31 01.6 +60 42 14   14.16 12.86     ~ 7 0
80 2MASS J20310189+6038116 RG* 20 31 01.8949749936 +60 38 11.616665712           ~ 8 0
81 2MASS J20310597+6042139 RG* 20 31 05.9725006344 +60 42 13.823912016   13.85 12.55     ~ 13 0
82 NGC 6939 121 * 20 31 24.3038962824 +60 37 43.127551776   13.50 12.41     ~ 17 0
83 2MASS J20314054+6037084 RG* 20 31 40.5499836264 +60 37 08.207863428   13.72 12.03     ~ 19 0
84 NGC 6939 OpC 20 31 40.6 +60 38 54           ~ 171 0
85 Cl* NGC 7142 HOAG 10 * 21 45 00.7326513600 +65 45 56.526864876 16.01 14.816 13.452   11.984 ~ 19 0
86 Cl* NGC 7142 CT 229 * 21 45 10.0085238816 +65 51 16.557226272   14.43 12.71 12.22   ~ 11 0
87 NGC 7142 OpC 21 45 10.2 +65 47 05   10.36 9.3     ~ 157 0
88 NGC 7142 98 * 21 45 29.4605657736 +65 46 28.990619292   14.58 13.46     ~ 14 0
89 NGC 7142 7 * 21 45 35.6713021128 +65 44 59.084800656 16.37 14.69 13.08     ~ 13 0
90 NAME PWM 4 OpC 23 50 53 +62 19.4           ~ 22 0
91 2MASS J23505744+6220031 * 23 50 57.449 +62 20 03.20   18.40 16.19     ~ 4 0
92 NGC 7789 212 * 23 56 40.9731034152 +56 41 47.044836204     13.260   11.944 ~ 14 0
93 NGC 7789 468 * 23 57 08.0503461336 +56 43 21.602897040   12.75 11.6115   9.722 K4III 46 0
94 NGC 7789 605 * 23 57 19.2105258408 +56 40 51.426837948   14.05 12.8171   11.482 K0III 30 0
95 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0
96 NGC 7789 765 RG* 23 57 31.8479523192 +56 41 22.053542748   12.80 11.59   10.053 ~ 52 0
97 NGC 1817 1456 ? ~ ~           ~ 1 0
98 NGC 2141 1821 ? ~ ~           ~ 1 0
99 NGC 7789 958 ? ~ ~           ~ 2 0
100 NGC 6192 137 ? ~ ~           ~ 1 0
101 Cl* Berkeley 39 KR 3 * ~ ~   14.90 13.55     ~ 11 0
102 NGC 6939 31 * ~ ~   12.99 11.16     ~ 6 0
103 NGC 2141 514 ? ~ ~           ~ 1 0

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