2016MNRAS.455.2417R

Query : 2016MNRAS.455.2417R

2016MNRAS.455.2417R - Mon. Not. R. Astron. Soc., 455, 2417-2439 (2016/January-3)

Detailed chemical abundances in NGC 5824: another metal-poor globular cluster with internal heavy element abundance variations.

ROEDERER I.U., MATEO M., BAILEY III J.I., SPENCER M., CRANE J.D. and SHECTMAN S.A.

Abstract (from CDS):

We present radial velocities, stellar parameters, and detailed abundances of 39 elements derived from high-resolution spectroscopic observations of red giant stars in the luminous, metal-poor globular cluster NGC 5824. We observe 26 stars in NGC 5824 using the Michigan/Magellan Fiber System (M2FS) and two stars using the Magellan Inamori Kyocera Echelle spectrograph. We derive a mean metallicity of [Fe/H] = -1.94±0.02 (statistical) ±0.10 (systematic). The metallicity dispersion of this sample of stars, 0.08 dex, is in agreement with previous work and does not exceed the expected observational errors. Previous work suggested an internal metallicity spread only when fainter samples of stars were considered, so we cannot exclude the possibility of an intrinsic metallicity dispersion in NGC 5824. The M2FS spectra reveal a large internal dispersion in [Mg/Fe], 0.28 dex, which is found in a few other luminous, metal-poor clusters. [Mg/Fe] is correlated with [O/Fe] and anticorrelated with [Na/Fe] and [Al/Fe]. There is no evidence for internal dispersion among the other α- or Fe-group abundance ratios. 25 of the 26 stars exhibit a n-capture enrichment pattern dominated by r-process nucleosynthesis (<[Eu/Fe]> = +0.11±0.12; <[Ba/Eu]> = -0.66±0.05). Only one star shows evidence of substantial s-process enhancement ([Ba/Fe] = +0.56±0.12; [Ba/Eu] = +0.38±0.14), but this star does not exhibit other characteristics associated with s-process enhancement via mass transfer from a binary companion. The Pb and other heavy elements produced by the s-process suggest a time-scale of no more than a few hundred Myr for star formation and chemical enrichment, like the complex globular clusters M2, M22, and NGC 5286.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: abundances - globular clusters: individual: NGC 5824

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 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
4 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
5 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
6 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
7 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 327 0
8 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 467 0
9 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
10 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
11 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 485 0
12 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 920 0
13 * 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
14 [DHS2014] 32004840 RG* 15 03 34.28 -33 05 06.4     16.688   15.395 ~ 2 0
15 [DHS2014] 31003079 RG* 15 03 36.7069050408 -33 01 32.282779800     16.795   15.534 ~ 2 0
16 [DHS2014] 71000779 RG* 15 03 43.8854428968 -33 06 40.055622804     17.033   15.797 ~ 2 0
17 [DHS2014] 52005710 RG* 15 03 45.8661647592 -33 04 34.350410784 18.540   16.958   15.731 ~ 3 0
18 [DHS2014] 32004229 RG* 15 03 46.8332339520 -33 05 43.175052420 18.257   16.523   15.241 ~ 3 0
19 [DHS2014] 52009395 RG* 15 03 47.7340089192 -33 03 01.292541948 18.745   17.369   16.203 ~ 3 0
20 [DHS2014] 71002877 RG* 15 03 50.3985870816 -33 05 20.683105656 18.259   15.808   14.359 ~ 4 0
21 [DHS2014] 51000173 RG* 15 03 50.8246749936 -33 01 53.964056100 18.538   16.890   15.650 ~ 3 0
22 [DHS2014] 42011439 RG* 15 03 51.5317838472 -33 03 01.426897368 18.521   16.897   15.669 ~ 3 0
23 [DHS2014] 42008343 AB* 15 03 53.6207806152 -33 04 04.733474628 18.209   16.494   15.232 ~ 3 0
24 [DHS2014] 41003361 RG* 15 03 53.9858324592 -32 59 53.084393520 18.588   17.060   15.856 ~ 3 0
25 [DHS2014] 61000182 RG* 15 03 54.3625536624 -33 06 58.536157752 18.586   16.975   15.726 ~ 3 0
26 [DHS2014] 42007539 RG* 15 03 54.4308844848 -33 04 18.976023120 18.133   15.945   14.553 ~ 3 0
27 [DHS2014] 42012437 RG* 15 03 54.5212796208 -33 02 38.936370408     17.056   15.845 ~ 2 0
28 [DHS2014] 42010715 RG* 15 03 54.9121361928 -33 03 16.452208908 18.342   16.619   15.349 ~ 3 0
29 [DHS2014] 61000397 RG* 15 03 54.9464424360 -33 06 39.881814912 18.229   16.308   14.953 ~ 3 0
30 [DHS2014] 42009955 RG* 15 03 55.9566671016 -33 03 35.610737544 18.176   15.917   14.533 ~ 4 0
31 [DHS2014] 61001052 RG* 15 03 56.12 -33 05 59.3 18.487   16.786   15.546 ~ 3 0
32 [DHS2014] 42006307 RG* 15 03 56.6671175280 -33 04 48.789926364 18.273   16.342   15.042 ~ 3 0
33 [DHS2014] 61007565 RG* 15 03 57.2327618568 -33 03 44.408355480     15.959   14.546 ~ 2 0
34 [DHS2014] 41002449 RG* 15 03 57.4418308464 -33 00 32.926043340 18.629   17.068   15.855 ~ 3 0
35 [DHS2014] 42011588 RG* 15 03 58.1600223096 -33 03 01.740802392 18.203   16.419   15.123 ~ 3 0
36 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
37 [DHS2014] 61000142 RG* 15 03 58.7357258832 -33 07 02.753284332 18.618   17.035   15.823 ~ 3 0
38 [DHS2014] 61007408 RG* 15 03 59.3895366120 -33 03 47.046054168 18.181   16.168   14.798 ~ 3 0
39 [DHS2014] 42011404 RG* 15 03 59.5309130640 -33 03 02.552376492 18.085   15.973   14.582 ~ 4 0
40 [DHS2014] 61008247 RG* 15 04 00.22 -33 03 33.3     16.429   15.148 ~ 2 0
41 [DHS2014] 21000267 RG* 15 04 00.6134883360 -33 04 24.149835120 18.035   15.606   14.130 ~ 4 0
42 [DHS2014] 42012172 RG* 15 04 00.7619253264 -33 02 45.176289324 18.499   16.958   15.743 ~ 3 0
43 [DHS2014] 42011097 RG* 15 04 01.0514761224 -33 03 08.504321040 18.375   16.651   15.384 ~ 3 0
44 [DHS2014] 61001836 RG* 15 04 01.5849409392 -33 05 26.780223804 18.569   16.883   15.658 ~ 3 0
45 [DHS2014] 42008555 AB* 15 04 01.6160870352 -33 04 00.391740816 18.365   16.977   15.769 ~ 3 0
46 [DHS2014] 61005163 RG* 15 04 02.0572405968 -33 04 20.134883532 18.324   15.908   14.523 ~ 4 0
47 [DHS2014] 42012704 RG* 15 04 02.5260008304 -33 02 32.057255724 18.161   16.186   14.835 ~ 3 0
48 [DHS2014] 41001607 RG* 15 04 03.9028838592 -33 01 05.722950144 18.337   16.149   14.789 ~ 3 0
49 [DHS2014] 42007331 RG* 15 04 04.87 -33 04 25.3 18.410   16.824   15.578 ~ 3 0
50 [DHS2014] 61001690 RG* 15 04 04.9366513608 -33 05 31.398314280 18.616   17.107   15.890 ~ 3 0
51 [DHS2014] 21000688 RG* 15 04 04.9984469208 -33 04 01.175725020 18.093   15.754   14.284 ~ 4 0
52 [DHS2014] 12001300 RG* 15 04 05.1064447368 -33 07 29.004099744 18.263   16.241   14.946 ~ 3 0
53 [DHS2014] 61000144 RG* 15 04 06.1722818208 -33 07 02.325357120 18.265   16.404   15.082 ~ 3 0
54 [DHS2014] 21002944 RG* 15 04 06.7382197584 -33 01 50.536860528 18.193   15.385   13.743 ~ 3 0
55 [DHS2014] 41000940 RG* 15 04 06.8337515400 -33 01 30.101249856 18.250   16.466   15.176 ~ 3 0
56 [DHS2014] 61000826 RG* 15 04 07.5746317824 -33 06 10.505496960 18.265   16.271   14.961 ~ 3 0
57 [DHS2014] 42010124 RG* 15 04 10.4490989256 -33 03 30.798100872 18.024   15.876   14.454 ~ 3 0
58 [DHS2014] 61003283 RG* 15 04 12.6153613776 -33 04 49.995576480 18.243   16.279   14.931 ~ 3 0
59 [DHS2014] 62000027 RG* 15 04 14.6015682192 -33 10 14.007314712 18.363   16.434   15.124 ~ 3 0
60 [DHS2014] 11001198 RG* 15 04 14.7674676192 -33 02 34.960528896 18.136   16.352   15.009 ~ 3 0
61 [DHS2014] 61000086 AB* 15 04 15.1072751032 -33 07 07.817548793 18.379   16.959   15.753 ~ 3 0
62 [DHS2014] 42006712 RG* 15 04 16.5564661920 -33 04 37.452084528     17.273   16.080 ~ 2 0
63 [DHS2014] 42013014 AB* 15 04 18.7131240432 -33 02 22.637079600 18.033   16.236   14.860 ~ 3 0
64 [DHS2014] 42007983 AB* 15 04 20.8509340680 -33 04 12.073235124 18.354   17.093   15.892 ~ 3 0
65 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 424 0
66 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 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 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
70 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
71 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 406 1
72 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
73 BD+17 3248 HB* 17 28 14.4690179544 +17 30 35.847574776   10.02 9.34     KIIvw 239 0
74 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
75 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
76 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
77 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
78 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
79 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
80 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
81 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 394 0
82 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
83 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
84 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0
85 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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