2009AJ....138.1171A

Query : 2009AJ....138.1171A

2009AJ....138.1171A - Astron. J., 138, 1171-1191 (2009/October-0)

Lithium in the intermediate-age open cluster, NGC 3680.

ANTHONY-TWAROG B.J., DELIYANNIS C.P., TWAROG B.A., CROXALL K.V. and CUMMINGS J.D.

Abstract (from CDS):

High-dispersion spectra centered on the Li 6708 Å line have been obtained for 70 potential members of the intermediate-age open cluster NGC 3680, with an emphasis on stars in the turnoff region of the cluster color-magnitude diagram (CMD). A measurable Li abundance has been derived for 53 stars, 39 of which have radial velocities and proper motions consistent with cluster membership. After being transferred to common temperature and abundance scales, previous Li estimates have been combined to generate a sample of 49 members, 40 of which bracket the cluster Li-dip. Spectroscopic elemental analysis of eight giants and five turnoff stars produces [Fe/H] = -0.17±0.07 (sd) and -0.07±0.02 (sd), respectively. We also report measurements of Ca, Si, and Ni which are consistent with scaled-solar ratios within the errors. Adopting [Fe/H] = -0.08 (Section 3.6), Y 2 isochrone comparisons lead to an age of 1.75±0.1 Gyr and an apparent modulus of (m - M) = 10.30±0.15 for the cluster, placing the center of the Li-dip at 1.35±0.03 M☉. Among the giants, five of the nine cluster members are now known to have measurable Li with A(Li) near 1.0. A combined sample of dwarfs in the Hyades and Praesepe is used to delineate the Li-dip profile at 0.7 Gyr and [Fe/H] = +0.15, establishing its center at 1.42±0.02 M☉ and noting the possible existence of a secondary dip on its red boundary. When evolved to the typical age of the clusters NGC 752 (age = 1.45 Gyr, (m - M) = 8.4), IC 4651 (age = 1.5 Gyr, (m - M) = 10.4), and NGC 3680, the Hyades/Praesepe Li-dip profile reproduces the observed morphology of the combined Li-dip within the CMDs of the intermediate-age clusters while implying a metallicity dependence for the central mass of the Li-dip given by M/M☉= 1.38±0.04 + 0.4±0.2 [Fe/H]. The implications of the similarity of the Li-dichotomy among giants in NGC 752 and IC 4651 and the disagreement with the pattern among NGC 3680 giants are discussed.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual (NGC 752, NGC 3680, IC 4651, Praesepe, Hyades) - stars: abundances - techniques: spectroscopic

CDS comments: KGP 1410A not identified.

Simbad objects: 85

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Number of rows : 85
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 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
2 NGC 752 207 * 01 57 37.7922307896 +37 49 50.233330164   13.88 13.20     K2.2 18 0
3 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
4 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
5 NGC 2168 OpC 06 09 07.5 +24 20 15           ~ 604 0
6 NGC 2420 OpC 07 38 24.6 +21 34 26   9.0 8.3     ~ 523 0
7 NGC 2506 OpC 08 00 02.3 -10 46 22   8.28 7.6     ~ 313 0
8 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
9 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
10 Cl* NGC 3680 KGP 802 * 11 24 31.7610988488 -43 07 49.704788820   17.81 16.75     ~ 4 0
11 Cl* NGC 3680 KGP 803 * 11 24 31.7779180152 -43 12 39.653578440   15.34 14.78     ~ 9 0
12 Cl* NGC 3680 KGP 833 * 11 24 34.8502290816 -43 18 18.540119844   16.37 15.59     ~ 4 0
13 Cl* NGC 3680 KGP 873 * 11 24 40.7480465736 -43 13 07.359976992   16.03 15.25     ~ 4 0
14 Cl* NGC 3680 KGP 936 * 11 24 48.4545246768 -43 12 17.122533192   13.123 12.700     ~ 17 0
15 Cl* NGC 3680 KGP 945 * 11 24 50.3996113944 -43 15 09.991691676   16.444 15.606     ~ 11 0
16 Cl* NGC 3680 KGP 952 * 11 24 51.1375913472 -43 09 15.916453812   12.94 12.36     ~ 17 0
17 Cl* NGC 3680 KGP 979 * 11 24 53.7750297552 -43 06 47.498588460   17.903 16.800     ~ 11 0
18 Cl* NGC 3680 KGP 983 * 11 24 54.7529130168 -43 13 47.914939560   15.623 14.990     ~ 11 0
19 NGC 3680 78 * 11 24 55.7276421456 -43 06 10.543404564   13.77 13.24     ~ 19 0
20 Cl* NGC 3680 KGP 1008 * 11 24 58.6163291832 -43 22 53.013257976   12.818 12.318     ~ 18 0
21 NGC 3680 1 * 11 25 01.5259746144 -43 10 23.148239664   12.45 11.98     ~ 22 0
22 NGC 3680 70 * 11 25 03.4757162376 -43 17 26.302286508   15.220 14.651     ~ 28 0
23 NGC 3680 4 * 11 25 06.3257435112 -43 15 49.350630744   13.45 12.95     ~ 14 0
24 Cl* NGC 3680 KGP 1097 * 11 25 07.9503690888 -43 19 27.047445816   14.785 14.194     ~ 16 0
25 Cl* NGC 3680 KGP 1119 * 11 25 10.43 -43 10 43.1   17.48 16.48     ~ 6 0
26 Cl* NGC 3680 KGP 1123 * 11 25 10.6556525976 -43 04 46.319387232   16.532 15.718     ~ 5 0
27 Cl* NGC 3680 EGG 72 * 11 25 12.1303648152 -43 20 01.245986340   13.190 12.768     ~ 16 0
28 NGC 3680 14 * 11 25 15.4708269408 -43 13 30.468205344   12.88 12.40     ~ 20 0
29 CD-42 6963 * 11 25 16.1744004384 -43 14 24.079251516   11.93 10.78     ~ 50 0
30 NGC 3680 15 * 11 25 18.2480573472 -43 11 49.657879140   13.05 12.54     ~ 22 0
31 NGC 3680 5 * 11 25 18.4752370488 -43 16 24.785019624   13.35 12.86     ~ 25 0
32 NGC 3680 16 * 11 25 19.5569444472 -43 10 27.604893360   13.89 13.35     ~ 20 0
33 Cl* NGC 3680 KGP 1202 * 11 25 19.7245635888 -43 11 38.983588980   17.22 16.43     ~ 6 0
34 NGC 3680 OpC 11 25 19.8 -43 14 38   8.40 7.6     ~ 340 0
35 NGC 3680 6 * 11 25 20.3761283736 -43 17 31.991602308   13.00 12.48     ~ 22 0
36 NGC 3680 19 * 11 25 20.4459696816 -43 09 02.428134840   13.00 12.49     ~ 19 0
37 Cl* NGC 3680 KGP 1218 * 11 25 22.2159458760 -43 26 10.941470988   14.46 13.95     ~ 9 0
38 NGC 3680 12 * 11 25 24.1589017056 -43 14 48.804849960   15.81 15.06     ~ 11 0
39 CD-42 6971 * 11 25 26.2329251328 -43 11 23.989609392   11.18 10.17     G5III 46 0
40 Cl* NGC 3680 KGP 1274 * 11 25 27.3540653208 -43 03 00.302623776   15.02 14.47     ~ 11 0
41 CD-42 6974 * 11 25 29.2495299072 -43 15 47.797382124   12.01 10.94     ~ 35 0
42 Cl* NGC 3680 BFK 62 * 11 25 31.3823168280 -43 11 16.698376716   15.45 14.42     ~ 17 0
43 NGC 3680 10 * 11 25 32.9774391600 -43 16 50.136025008   13.35 12.91     ~ 24 0
44 NGC 3680 39 * 11 25 33.9147908136 -43 10 48.334011096   12.93 12.41     ~ 24 0
45 Cl* NGC 3680 BFK 125 * 11 25 34.5329369112 -43 15 10.470724344   14.118 13.685     ~ 19 0
46 NGC 3680 38 * 11 25 35.8306674792 -43 11 21.118236180   13.00 12.47     ~ 26 0
47 NGC 3680 33 * 11 25 36.0319597296 -43 14 06.142839936   12.40 11.88     ~ 22 0
48 Cl* NGC 3680 BFK 169 * 11 25 36.28 -43 17 26.0   16.44 15.54     ~ 7 0
49 Cl* NGC 3680 KGP 1355 * 11 25 36.4471765104 -43 20 55.038267492   17.564 16.639     ~ 5 0
50 Cl* NGC 3680 BFK 116 * 11 25 36.96 -43 14 21.4   13.29 12.77     ~ 11 0
51 CD-42 6977 * 11 25 38.0643019800 -43 16 06.379106556   12.1 10.8     ~ 45 0
52 NGC 3680 35 * 11 25 38.1499544496 -43 13 27.167971548   13.67 13.17     ~ 24 0
53 CD-42 6976 MS* 11 25 38.6652469728 -43 13 58.792503612   11.56 10.69     G0V 41 0
54 NGC 3680 37 * 11 25 41.1599080608 -43 12 09.106252056   13.59 13.13     ~ 19 0
55 CD-42 6978 SB* 11 25 41.9407631736 -43 17 06.905574420   11.93 10.78     ~ 51 0
56 NGC 3680 31 * 11 25 41.9523502320 -43 14 03.462286308   13.68 13.22     ~ 13 0
57 Cl* NGC 3680 BFK 134 * 11 25 47.07 -43 17 44.1   16.68 15.78     ~ 7 0
58 NGC 3680 32 * 11 25 47.27 -43 14 11.0   13.44 12.95     ~ 12 0
59 CD-42 6981 * 11 25 48.5315765064 -43 09 52.530808176   12.043 10.886 10.08 9.829 ~ 65 0
60 CD-42 6983 * 11 25 49.9058331792 -43 12 15.712705908   11.3 10.02     K0III 43 0
61 NGC 3680 42 * 11 25 54.4867023456 -43 09 56.627421624   13.51 13.04     ~ 15 0
62 NGC 3680 46 * 11 25 54.5413183968 -43 14 23.440856748   13.811 13.416     ~ 19 0
63 NGC 3680 43 * 11 25 55.0229330664 -43 10 05.030561892   12.95 12.50     ~ 24 0
64 NGC 3680 45 * 11 25 56.5374095952 -43 13 01.622067420   12.60 12.04     ~ 17 0
65 Cl* NGC 3680 HTR M111 * 11 25 56.9288669160 -43 15 31.495255488   13.976 13.543     ~ 13 0
66 Cl* NGC 3680 HTR M13 * 11 25 57.8487471192 -43 08 15.652200552   14.834 14.339     ~ 15 0
67 Cl* NGC 3680 KGP 1554 * 11 26 00.8801222952 -43 05 31.256706300   14.84 14.28     ~ 14 0
68 Cl* NGC 3680 KGP 1575 * 11 26 02.90 -43 20 07.6   15.01 14.47     ~ 6 0
69 Cl* NGC 3680 NAA 2005 * 11 26 04.3330380792 -43 14 13.479916153   16.985 16.102     ~ 11 0
70 Cl* NGC 3680 HTR M102 * 11 26 06.5526173188 -43 15 00.398824182   17.74 16.73     ~ 10 0
71 Cl* NGC 3680 KGP 1612 * 11 26 06.7539251784 -43 19 50.125997136   16.09 15.44     ~ 14 0
72 Cl* NGC 3680 HTR M157 * 11 26 08.0357671330 -43 18 25.221725615   14.076 13.676     ~ 14 0
73 Cl* NGC 3680 KGP 1627 * 11 26 08.1778344912 -43 22 33.167419932   16.708 15.859     ~ 5 0
74 NGC 3680 58 * 11 26 09.1609410048 -43 12 14.012108172   13.45 12.96     ~ 16 0
75 Cl* NGC 3680 KGP 1649 * 11 26 10.2779545488 -43 21 59.217887340   12.86 12.37     ~ 18 0
76 NGC 3680 51 * 11 26 14.38 -43 14 22.4   15.38 14.70     ~ 5 0
77 Cl* NGC 3680 KGP 1722 * 11 26 17.73 -43 12 05.3   15.817 15.056     ~ 5 0
78 NGC 3680 60 * 11 26 20.7065904912 -43 13 07.467128544   14.99 14.36     ~ 33 0
79 Cl* NGC 3680 KGP 1815 * 11 26 29.3783139384 -43 08 42.900162108   15.798 15.095     ~ 5 0
80 NGC 3680 53 * 11 26 36.4327300968 -43 15 13.920198264   11.8 10.7     K1IV 38 0
81 NGC 6253 OpC 16 59 06.4 -52 42 39     10.2     ~ 209 0
82 IC 4651 OpC 17 24 48.5 -49 55 23           ~ 374 0
83 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0
84 HD 223311 V* 23 48 32.4794141016 -06 22 49.524743316   7.526 6.069     K2/3III 59 0
85 * gam01 Oct PM* 23 52 06.4731826440 -82 01 07.763587140   6.043 5.106     G6/8III 61 0

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