2017ApJ...842...49L

Query : 2017ApJ...842...49L

2017ApJ...842...49L - Astrophys. J., 842, 49-49 (2017/June-2)

Timing the evolution of the Galactic disk with NGC 6791: an open cluster with peculiar high-α chemistry as seen by APOGEE.

LINDEN S.T., PRYAL M., HAYES C.R., TROUP N.W., MAJEWSKI S.R., ANDREWS B.H., BEERS T.C., CARRERA R., CUNHA K., FERNANDEZ-TRINCADO J.G., FRINCHABOY P., GEISLER D., LANE R.R., NITSCHELM C., PAN K., ALLENDE PRIETO C., ROMAN-LOPES A., SMITH V.V., SOBECK J., TANG B., VILLANOVA S. and ZASOWSKI G.

Abstract (from CDS):

We utilize elemental-abundance information for Galactic red giant stars in five open clusters (NGC 7789, NGC 6819, M67, NGC 188, and NGC 6791) from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) DR13 data set to age-date the chemical evolution of the high- and low-α element sequences of the Milky Way (MW). Key to this time-stamping is the cluster NGC 6791, whose stellar members have mean abundances that place it in the high-α, high-[Fe/H] region of the [α/Fe]-[Fe/H] plane. Based on the cluster's age (∼8 Gyr), Galactocentric radius, and height above the Galactic plane, as well as comparable chemistry reported for APOGEE stars in Baade's Window, we suggest that the two most likely origins for NGC 6791 are as an original part of the thick disk, or as a former member of the Galactic bulge. Moreover, because NGC 6791 lies at the high-metallicity end ([Fe/H] ∼ 0.4) of the high-α sequence, the age of NGC 6791 places a limit on the youngest age of stars in the high-metallicity, high-α sequence for the cluster's parent population (i.e., either the bulge or the disk). In a similar way, we can also use the age and chemistry of NGC 188 to set a limit of ∼7 Gyr on the oldest age of the low-α sequence of the MW. Therefore, NGC 6791 and NGC 188 are potentially a pair of star clusters that bracket both the timing and the duration of an important transition point in the chemical history of the MW.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: disk - Galaxy: evolution - Galaxy: stellar content - open clusters and associations: individual: (NGC 6791, NGC 188) - stars: abundances - stars: abundances

Simbad objects: 105

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Number of rows : 105
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 118 Sy2 00 27 16.2247090937 -01 46 48.519491282   14.9       ~ 43 0
2 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
3 2MASS J00533497+8511145 RG* 00 53 35.0448648024 +85 11 14.559397872 15.586 14.55 13.41 12.737 12.171 ~ 34 0
4 2MASS J01025280+8517563 RG* 01 02 52.7992530816 +85 17 56.181828732   14.024 12.684     ~ 28 0
5 NGC 2682 4 RG* 08 50 36.1346743896 +11 43 18.093424152 14.180 13.72 12.689   11.746 G8IV 47 0
6 Cl* NGC 2682 SAND 721 RG* 08 50 49.6386842857 +11 35 08.946388097   11.76 11.178 10.972 10.170 K1III 71 0
7 NGC 2682 20 Pe* 08 50 49.9469249705 +11 49 12.771453264 14.186 13.78 12.889   11.998 G8V 79 0
8 NGC 2682 37 RB? 08 50 58.1579169528 +11 52 22.369391242 14.489 13.8 12.806   11.881 K0IV 81 0
9 NGC 2682 46 Pe* 08 51 00.1768051728 +11 54 32.104231704 13.991 13.541 12.764   11.889 G5IV 59 0
10 NGC 2682 48 RB? 08 51 01.0583959920 +11 50 10.912564680 13.781 13.47 12.699   11.895 G2IV 51 0
11 NGC 2682 72 RG* 08 51 08.3845013448 +11 47 12.146447796   13.39 12.315     F0V 95 0
12 NGC 2682 79 SB* 08 51 09.5057618280 +11 41 45.027626316   13.56 12.761     G2IV 48 0
13 NGC 2682 84 HB* 08 51 12.6931158192 +11 52 42.446745336   11.629 10.393 10.234 9.500 K1III 152 0
14 NGC 2682 36 RB? 08 51 15.6379167000 +11 50 56.225142420 14.310 13.87 13.015   12.10 G9V 51 0
15 NGC 2682 104 RG* 08 51 17.0400668664 +11 50 46.501856052   12.114 11.001 10.863 10.12 K0III/IV 97 0
16 Cl* NGC 2682 ES IV-18 RB? 08 51 18.7725199776 +11 51 18.706433544 14.351 13.93 13.026   12.114 G9IV 52 0
17 Cl* NGC 2682 ES IV-96 RG* 08 51 18.9732499896 +11 58 11.037897372 13.989 13.30 12.272     ~ 59 0
18 NGC 2682 135 RG* 08 51 21.5640702312 +11 46 06.216394188   12.53 11.394   10.39 K1III 122 0
19 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
20 NGC 2682 151 RG* 08 51 26.1833544456 +11 53 51.981683748   11.58 10.391     K1III 124 0
21 NGC 2682 163 Ro* 08 51 28.8031691832 +11 51 59.977626372   13.36 12.658   11.916 G1IV 47 0
22 NGC 2682 164 RG* 08 51 28.9910274072 +11 50 33.127331784   11.675 10.441 10.250 9.46 K1III 162 0
23 NGC 2682 166 Pe* 08 51 29.3544247680 +11 45 27.647071884 14.413 13.85 12.910   11.962 K0IV 83 0
24 NGC 2682 192 Pe* 08 51 35.4048721128 +11 57 56.554444188 13.879 13.583 12.817     G2IV 59 0
25 NGC 2682 193 RG* 08 51 35.7789056016 +11 53 34.748492712 13.904 13.22 12.267   11.228 K0III 121 0
26 Cl* NGC 2682 ES III-35 RG* 08 51 39.3860048856 +11 51 45.671254056 13.832 13.1 12.117   11.078 K0III 89 0
27 NGC 2682 218 RG* 08 51 42.3411424776 +11 50 07.677862008   12.71 11.48     K1III 84 0
28 NGC 2682 217 RG* 08 51 42.3635843520 +11 51 23.075134668   12.80 11.23     K1III 101 0
29 NGC 2682 223 RG* 08 51 43.8874792752 +11 56 42.528745068   11.658 10.476   9.500 K1III 114 0
30 NGC 2682 226 Pe* 08 51 44.0075287632 +11 46 24.535277112 13.749 13.549 12.790   11.928 G0 83 0
31 NGC 2682 227 RB? 08 51 44.7392991552 +11 46 46.046943048 14.402 13.898 13.000   11.994 K0IV 78 0
32 NGC 2682 231 RG* 08 51 45.0772293264 +11 47 45.971197080   12.57 11.468     K1III 127 0
33 NGC 2682 237 * 08 51 48.8385365448 +11 56 51.245718540 14.453 13.82 12.982     K0IV 49 0
34 NGC 2682 262 RB? 08 51 56.1167034360 +11 50 14.841071664 14.595 13.9 12.976   11.906 K0IV 53 0
35 NGC 2682 266 RG* 08 51 59.5227693496 +11 55 04.835590251   11.65 10.463   9.490 K1III 113 0
36 NGC 2682 281 V* 08 52 11.3482966608 +11 45 37.976349384 14.016 13.734 12.951   12.019 G5IV 52 0
37 NGC 2682 286 HB* 08 52 18.5744408733 +11 44 26.374152806   11.541 10.382   9.430 K0III 101 0
38 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
39 NAME Baade Window reg 18 03.5 -30 01           ~ 643 3
40 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
41 NGC 6791 2001 RG* 19 20 53.3864977320 +37 48 28.185824880   15.357 13.741   11.96 K9III 49 0
42 NGC 6791 3018 RG* 19 20 55.3072689384 +37 43 15.284180028   16.032 14.557   13.027 K4III 43 0
43 Cl* NGC 6791 SBG 10898 RG* 19 21 01.1211981504 +37 42 13.462608672   15.949 14.459   12.890 M0e 51 0
44 NGC 6791 3003 RG* 19 21 04.2668772550 +37 47 18.701137615   15.424 13.85   12.19 M0.0III 54 0
45 Cl* NGC 6791 SBG 13260 RG* 19 21 10.0694786424 +37 50 00.860243460           ~ 39 0
46 NGC 6819 27 RG* 19 40 36.8439134770 +40 15 17.244926338     14.130   12.96 ~ 50 0
47 NGC 6819 765 RG* 19 40 48.0357775068 +40 08 08.462359969     12.850   11.48 K1.5III 61 0
48 NGC 6819 112 RG* 19 40 49.6541452533 +40 14 31.281979204     13.370   12.09 G5III 53 0
49 2MASS J19405020+4013109 RG* 19 40 50.2024013187 +40 13 10.917132030     13.11   11.85 ~ 57 0
50 NGC 6819 886 RG* 19 40 55.5993547848 +40 06 29.233228968   13.38 12.36   10.99 ~ 43 0
51 NGC 6819 138 RG* 19 40 56.0080076374 +40 13 39.553372067     14.080   12.90 K1IV 64 0
52 2MASS J19405797+4008174 RG* 19 40 57.9664499956 +40 08 17.447974622     12.94   11.66 ~ 55 0
53 UCAC4 652-075387 HB* 19 41 05.2400213184 +40 14 04.202511216     13.097 12.856 11.82 ~ 41 0
54 NGC 6819 490 RG* 19 41 06.2142791232 +40 10 53.271517764     14.070   12.88 ~ 44 0
55 Cl* NGC 6819 P 31 RG* 19 41 08.1952979208 +40 15 08.552337948   14.44 13.31   12.15 G6V 44 0
56 Cl* NGC 6819 P 27 RG* 19 41 08.5886081903 +40 13 29.915883413   14.31 13.11   11.83 ~ 56 0
57 Cl* NGC 6819 P 29 RG* 19 41 09.2637488472 +40 14 43.632249936   14.40 13.14   11.85 ~ 55 0
58 NGC 6819 983 RG* 19 41 09.9100335000 +40 15 49.525282728   14.20 12.93   11.65 ~ 54 0
59 KOI-6494 RG* 19 41 11.0264553173 +40 11 11.674109278   12.78 11.63   10.51 G6V 40 0
60 Cl* NGC 6819 P 7 RG* 19 41 11.1553233501 +40 11 42.298423537   12.92 11.58   10.29 ~ 41 0
61 UCAC4 652-075477 RG* 19 41 12.7911483480 +40 12 23.914131372   13.370 12.436 12.914 11.86 ~ 47 0
62 NGC 6819 333 RG* 19 41 13.5487948872 +40 12 20.541915036   14.245 13.04   11.80 ~ 58 1
63 2MASS J19411367+4003382 HB* 19 41 13.6692983051 +40 03 38.196221649     13.59   12.31 ~ 60 0
64 NGC 6819 978 RG* 19 41 14.7616420032 +40 11 00.796691832   13.82 12.86   11.60 ~ 41 0
65 NGC 6819 616 RG* 19 41 15.6410633736 +40 10 10.544991672   14.17 13.24   11.94 ~ 41 0
66 NGC 6819 550 RG* 19 41 17.0521593408 +40 10 51.852693756   12.524 11.125 11.243 9.92 ~ 40 0
67 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0
68 UCAC3 261-166340 RG* 19 41 18.9247568640 +40 11 40.989183216     13.38 13.16 12.07 ~ 26 0
69 NGC 6819 472 RG* 19 41 21.3616104480 +40 11 00.221213472     13.120   11.79 ~ 40 0
70 Cl* NGC 6819 P 28 RG* 19 41 21.4748707569 +40 13 57.324959648   14.29 13.07   11.77 K1IV 61 0
71 NGC 6819 389 RG* 19 41 21.7633631736 +40 12 11.168954028     13.190   11.87 ~ 42 0
72 2MASS J19412222+4016442 RG* 19 41 22.2248500176 +40 16 44.214161520     13.280   11.89 ~ 52 0
73 Cl* NGC 6819 P 12 RG* 19 41 23.6934421187 +40 12 35.514837565 15.15 13.48 12.02 11.68 10.28 K3III 44 0
74 2MASS J19412386+4021444 RG* 19 41 23.8585012663 +40 21 44.472594000     13.00   11.72 ~ 49 0
75 NGC 6819 975 RG* 19 41 26.5876718159 +40 11 41.781064648   13.59 12.22   10.72 K1IV 46 0
76 Cl* NGC 6819 P 17 RG* 19 41 27.0761609688 +40 12 28.325639880   13.88 12.63   11.25 ~ 53 0
77 2MASS J19412730+4004548 HB* 19 41 27.3044513832 +40 04 54.783323040     14.23   12.90 G6V 43 0
78 Cl* NGC 6819 P 25 RG* 19 41 29.1453700745 +40 13 04.090576666   14.15 13.11   11.84 ~ 52 0
79 NGC 6819 178 RG* 19 41 29.4199026024 +40 14 19.955558616     13.220   11.89 ~ 44 0
80 Cl* NGC 6819 P 24 RG* 19 41 29.5366520118 +40 12 20.975296318   14.20 13.08   11.77 K1.5III 62 0
81 2MASS J19413027+4015218 RG* 19 41 30.2734467292 +40 15 21.644308992     12.99   11.73 K2III 58 0
82 Cl* NGC 6819 P 8 RG* 19 41 30.3117442207 +40 09 00.508241509   13.29 11.69   9.83 K4III 51 0
83 Cl* NGC 6819 P 30 RG* 19 41 33.3070583268 +40 12 34.864776176   14.53 13.18   11.84 K1IV 57 0
84 TYC 3140-2350-1 RG* 19 41 34.3948190103 +40 17 48.192852940   12.96 11.37     K4III 59 0
85 NGC 6819 943 RG* 19 41 44.2720729835 +40 05 52.654892437     13.080   11.74 K2III 55 0
86 2MASS J19415064+4016010 RG* 19 41 50.6467280448 +40 16 01.023131640     14.310   13.12 ~ 53 0
87 2MASS J19415437+4002097 RG* 19 41 54.3838426294 +40 02 09.674906698     13.49   12.31 K1V 42 0
88 2MASS J23554966+5639180 RG* 23 55 49.6614942492 +56 39 18.042075577     12.188   13.716 C: 24 0
89 2MASS J23562953+5648399 RG* 23 56 29.5265491272 +56 48 39.924192420     13.19     ~ 25 0
90 NGC 7789 200 RG* 23 56 39.2985490488 +56 45 24.202095588     13.161   11.811 ~ 25 0
91 NGC 7789 232 RG* 23 56 43.0430402280 +56 50 47.685541128   14.41 13.107   11.712 ~ 31 0
92 NGC 7789 353 RG* 23 56 57.5153755656 +56 45 27.139175388     12.592   11.075 ~ 50 0
93 NGC 7789 476 RG* 23 57 08.9526221314 +56 48 50.332490009   14.38 13.1774   11.831 ~ 32 0
94 NGC 7789 549 RG* 23 57 14.0025494832 +56 40 58.646633376   13.7 12.2895   10.776 K2III 35 0
95 2MASS J23571728+5645333 RG* 23 57 17.2845748536 +56 45 33.189067152     13.203   11.921 ~ 23 0
96 NGC 7789 593 HB* 23 57 18.4710230592 +56 50 27.006375768   14.3 13.012   11.63 ~ 33 0
97 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0
98 NGC 7789 765 RG* 23 57 31.8479523192 +56 41 22.053542748   12.80 11.59   10.053 ~ 52 0
99 NGC 7789 814 RG* 23 57 35.6283678264 +56 40 00.017856552     12.957   11.67 ~ 25 0
100 NGC 7789 1005 HB* 23 57 54.399120 +56 47 44.00016   13.89 12.82 12.67 11.623 ~ 24 0
101 2MASS J23580015+5650125 RG* 23 58 00.1705050211 +56 50 12.592624213     11.986   10.368 ~ 29 0
102 NGC 7789 1082 RG* 23 58 02.7570176064 +56 47 20.936951412     12.933   11.497 ~ 25 0
103 2MASS J23581471+5651466 RG* 23 58 14.7154514856 +56 51 46.686956868     11.576   9.887 ~ 26 0
104 NAME Galactic Bulge reg ~ ~           ~ 4794 0
105 NAME Local Group GrG ~ ~           ~ 9325 0

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