2017ApJ...842...24J

Query : 2017ApJ...842...24J

2017ApJ...842...24J - Astrophys. J., 842, 24-24 (2017/June-2)

Chemical complexity in the eu-enhanced monometallic globular NGC 5986.

JOHNSON C.I., CALDWELL N., RICH R.M., MATEO M., BAILEY III J.I., OLSZEWSKI E.W. and WALKER M.G.

Abstract (from CDS):

NGC 5986 is a poorly studied but relatively massive Galactic globular cluster that shares several physical and morphological characteristics with "iron-complex" clusters known to exhibit significant metallicity and heavy-element dispersions. In order to determine whether NGC 5986 joins the iron-complex cluster class, we investigated the chemical composition of 25 red giant branch and asymptotic giant branch cluster stars using high-resolution spectra obtained with the Magellan-M2FS instrument. Cluster membership was verified using a combination of radial velocity and [Fe/H] measurements, and we found the cluster to have a mean heliocentric radial velocity of +99.76 km s–1 (σ = 7.44 km s–1). We derived a mean metallicity of [Fe/H] = -1.54 dex (σ = 0.08 dex), but the cluster's small dispersion in [Fe/H] and low [La/Eu] abundance preclude it from being an iron-complex cluster. NGC 5986 has <[Eu/Fe]>=+0.76 dex (σ = 0.08 dex), which is among the highest ratios detected in a Galactic cluster, but the small [Eu/Fe] dispersion is puzzling because such high values near [Fe/H] ∼ -1.5 are typically only found in dwarf galaxies exhibiting large [Eu/Fe] variations. NGC 5986 exhibits classical globular cluster characteristics, such as uniformly enhanced [α/Fe] ratios, a small dispersion in Fe-peak abundances, and (anti)correlated light-element variations. Similar to NGC 2808, we find evidence that NGC 5986 may host at least four to five populations with distinct light-element compositions, and the presence of a clear Mg-Al anticorrelation along with an Al-Si correlation suggests that the cluster gas experienced processing at temperatures >=65-70 MK. However, the current data do not support burning temperatures exceeding ∼100 MK. We find some evidence that the first- and second-generation stars in NGC 5986 may be fully spatially mixed, which could indicate that the cluster has lost a significant fraction of its original mass.

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

Journal keyword(s): globular clusters: general - globular clusters: individual: NGC 5986 - stars: abundances - stars: abundances

Simbad objects: 97

goto Full paper

goto View the references in ADS

Number of rows : 97
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 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
4 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
5 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
6 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
7 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
8 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
9 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
10 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
11 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
12 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
13 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
14 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 467 0
15 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
16 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
17 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 485 0
18 * 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
19 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
20 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
21 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 424 0
22 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
23 Cl* NGC 5986 ABO 270 * 15 45 28.8704240880 -37 48 56.204329032           ~ 1 0
24 Cl* NGC 5986 ABO 176 * 15 45 32.8054193016 -37 43 58.046816352           ~ 1 0
25 Cl* NGC 5986 ABO 135 * 15 45 39.1573628112 -37 52 11.103628908           ~ 1 0
26 Cl* NGC 5986 ABO 87 * 15 45 40.2450024336 -37 41 58.950615660           ~ 1 0
27 Cl* NGC 5986 ABO 158 * 15 45 51.6476865168 -37 47 03.126931044           ~ 1 0
28 Cl* NGC 5986 ABO 153 * 15 45 55.1097547440 -37 46 06.330462384           ~ 1 0
29 Cl* NGC 5986 ABO 55 * 15 45 55.2480683160 -37 46 52.859458452           ~ 1 0
30 Cl* NGC 5986 ABO 85 * 15 45 55.3206934368 -37 48 26.672968440           ~ 1 0
31 Cl* NGC 5986 ABO 83 * 15 45 56.8330339536 -37 47 41.410659048           ~ 1 0
32 Cl* NGC 5986 ABO 90 * 15 45 57.2891483784 -37 48 24.571039824           ~ 1 0
33 Cl* NGC 5986 ABO 80 * 15 45 57.4354032816 -37 45 41.643560556           ~ 1 0
34 Cl* NGC 5986 ABO 111 * 15 45 57.6864290688 -37 46 46.623653580           ~ 1 0
35 Cl* NGC 5986 ABO 81 * 15 45 58.4402684232 -37 47 53.822696208           ~ 1 0
36 Cl* NGC 5986 ABO 127 * 15 45 58.861 -37 47 09.19           ~ 1 0
37 Cl* NGC 5986 ABO 77 * 15 45 59.2645605912 -37 46 38.351124120           ~ 1 0
38 Cl* NGC 5986 ABO 25 Ce? 15 46 00.2512323072 -37 48 23.181506244           ~ 5 0
39 Cl* NGC 5986 ABO 78 * 15 46 00.3115327416 -37 46 05.778565428           ~ 1 0
40 Cl* NGC 5986 ABO 110 * 15 46 00.398 -37 47 51.70           ~ 1 0
41 Cl* NGC 5986 ABO 86 LP? 15 46 00.7879093759 -37 45 42.600972660           ~ 2 0
42 Cl* NGC 5986 ABO 151 * 15 46 01.8552444072 -37 49 19.556548896           ~ 1 0
43 Cl* NGC 5986 ABO 69 * 15 46 02.0674482936 -37 45 37.277902692           ~ 1 0
44 Cl* NGC 5986 ABO 132 * 15 46 02.5358076768 -37 46 03.575973468           ~ 1 0
45 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
46 Cl* NGC 5986 ABO 45 * 15 46 03.0387987312 -37 45 28.703175948           ~ 1 0
47 Cl* NGC 5986 ABO 126 * 15 46 03.172 -37 47 59.82           ~ 1 0
48 Cl* NGC 5986 ABO 99 * 15 46 03.3272737848 -37 48 24.971502780           ~ 1 0
49 Cl* NGC 5986 ABO 112 * 15 46 04.7722956816 -37 49 18.701373972           ~ 1 0
50 Cl* NGC 5986 ABO 121 * 15 46 05.8286986488 -37 48 00.252923544           ~ 1 0
51 Cl* NGC 5986 ABO 100 * 15 46 06.1307432328 -37 49 56.369527572           ~ 1 0
52 Cl* NGC 5986 ABO 152 * 15 46 06.9127110264 -37 50 18.458992896           ~ 1 0
53 Cl* NGC 5986 ABO 60 * 15 46 07.5166102272 -37 46 54.317827848           ~ 1 0
54 Cl* NGC 5986 ABO 57 * 15 46 08.9601026520 -37 49 04.624418820           ~ 1 0
55 Cl* NGC 5986 ABO 102 * 15 46 09.579 -37 47 33.37           ~ 1 0
56 Cl* NGC 5986 ABO 116 * 15 46 10.2268165896 -37 49 55.837080588           ~ 1 0
57 Cl* NGC 5986 ABO 123 * 15 46 10.2643967280 -37 46 16.886683740           ~ 1 0
58 Cl* NGC 5986 ABO 140 * 15 46 12.2344793352 -37 47 11.929379604           ~ 1 0
59 Cl* NGC 5986 ABO 129 * 15 46 13.0388286912 -37 46 00.960676860           ~ 1 0
60 Cl* NGC 5986 ABO 65 Pe* 15 46 16.3116032280 -37 44 46.905316260           ~ 4 0
61 Cl* NGC 5986 ABO 139 * 15 46 19.9399961952 -37 43 44.707237608           ~ 1 0
62 Cl* NGC 5986 ABO 194 * 15 46 21.4825499856 -37 44 16.006898328           ~ 1 0
63 Cl* NGC 5986 ABO 71 * 15 46 22.2158881800 -37 41 06.742433148           ~ 1 0
64 Cl* NGC 5986 ABO 228 * 15 46 27.266 -37 44 26.73           ~ 1 0
65 Cl* NGC 5986 ABO 30 * 15 46 34.0927319232 -37 49 55.691349456           ~ 1 0
66 2MASS J15464077-3744246 * 15 46 40.7790824808 -37 44 24.646890516           ~ 1 0
67 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 780 0
68 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
69 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
70 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
71 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
72 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
73 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
74 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 406 1
75 2MASS J17024412-2616495 Pe* 17 02 44.1240918624 -26 16 49.559847420           ~ 5 0
76 NGC 6287 GlC 17 05 09.4906767360 -22 42 28.099250172   11.49 10.30     ~ 240 0
77 NGC 6293 GlC 17 10 10.42 -26 34 54.2           ~ 309 0
78 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
79 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
80 NGC 6342 GlC 17 21 10.14 -19 35 14.7     10.01     ~ 310 0
81 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 425 0
82 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 344 0
83 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 208 0
84 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
85 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
86 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
87 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
88 NGC 6541 GlC 18 08 02.36 -43 42 53.6           ~ 409 0
89 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
90 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
91 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
92 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
93 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
94 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
95 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
96 NAME Local Group GrG ~ ~           ~ 9325 0
97 NAME Galactic Bulge reg ~ ~           ~ 4794 0

To bookmark this query, right click on this link: simbad:objects in 2017ApJ...842...24J and select 'bookmark this link' or equivalent in the popup menu