2017AJ....154..155J


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET21:55:21

2017AJ....154..155J - Astron. J., 154, 155-155 (2017/October-0)

Light and heavy element abundance variations in the outer halo globular cluster NGC 6229.

JOHNSON C.I., CALDWELL N., RICH R.M. and WALKER M.G.

Abstract (from CDS):

NGC 6229 is a relatively massive outer halo globular cluster that is primarily known for exhibiting a peculiar bimodal horizontal branch morphology. Given the paucity of spectroscopic data on this cluster, we present a detailed chemical composition analysis of 11 red giant branch members based on high resolution (R ≃ 38,000), high S/N (>100) spectra obtained with the MMT-Hectochelle instrument. We find the cluster to have a mean heliocentric radial velocity of -138.1–1.0+1.0 km s–1, a small dispersion of 3.8–0.7+1.0 km s–1, and a relatively low (M/LV)=0.82–0.28+0.49. The cluster is moderately metal-poor with <[Fe/H]>=-1.13 dex and a modest dispersion of 0.06 dex. However, 18% (2/11) of the stars in our sample have strongly enhanced [La, Nd/Fe] ratios that are correlated with a small (∼0.05 dex) increase in [Fe/H]. NGC 6229 shares several chemical signatures with M75, NGC 1851, and the intermediate metallicity populations of ω Cen, which lead us to conclude that NGC 6229 is a lower mass iron-complex cluster. The light elements exhibit the classical (anti-)correlations that extend up to Si, but the cluster possesses a large gap in the O-Na plane that separates first and second generation stars. NGC 6229 also has unusually low [Na, Al/Fe] abundances that are consistent with an accretion origin. A comparison with M54 and other Sagittarius clusters suggests that NGC 6229 could also be the remnant core of a former dwarf spheroidal galaxy.

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

Journal keyword(s): globular clusters: general - globular clusters: individual: NGC 6229 - stars: abundances - stars: abundances

VizieR on-line data: <Available at CDS (J/AJ/154/155): table1.dat table2.dat table3.dat table4.dat table5.dat>

Simbad objects: 80

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Number of rows : 80

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Sgr Stream St* 02 22 +00.0           ~ 664 0
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1252 0
3 NAME PYX GLOBULAR CL GlC 09 07 57.80 -37 13 17.0           ~ 83 0
4 NGC 2808 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1254 0
5 NGC 3201 GlC 10 17 36.82 -46 24 44.9   9.18 8.24     ~ 734 0
6 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 319 1
7 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 324 0
8 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3032 0
9 NGC 5286 GlC 13 46 26.81 -51 22 27.3   9.18 8.31     ~ 367 0
10 * 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 2148 0
11 NGC 5694 GlC 14 39 36.52 -26 32 18.0   11.58 10.89     ~ 269 0
12 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 330 0
13 2MASS J16451881+4734262 * 16 45 18.8167884700 +47 34 26.197725536           ~ 1 0
14 2MASS J16452323+4733276 * 16 45 23.2357231716 +47 33 27.518374139           ~ 1 0
15 2MASS J16453637+4743149 * 16 45 36.3724864291 +47 43 14.939759097           ~ 1 0
16 2MASS J16453643+4723148 * 16 45 36.4243138114 +47 23 14.837496289           ~ 1 0
17 2MASS J16454657+4737036 * 16 45 46.5853559131 +47 37 03.497075494           ~ 1 0
18 2MASS J16455361+4744279 * 16 45 53.6232055302 +47 44 27.905535159           ~ 1 0
19 2MASS J16460104+4747575 * 16 46 01.0527865654 +47 47 57.395349757           ~ 1 0
20 2MASS J16460964+4720273 * 16 46 09.6472044597 +47 20 27.428247913           ~ 1 0
21 2MASS J16461166+4745117 * 16 46 11.6682268878 +47 45 11.656909826           ~ 1 0
22 2MASS J16461515+4730523 * 16 46 15.1531860964 +47 30 52.457460232           ~ 1 0
23 2MASS J16461569+4743371 * 16 46 15.7083928287 +47 43 37.128963284           ~ 1 0
24 2MASS J16461661+4723453 * 16 46 16.6137964213 +47 23 45.336428277           ~ 1 0
25 2MASS J16461965+4744207 * 16 46 19.6543251909 +47 44 20.709806124           ~ 1 0
26 2MASS J16463089+4712585 * 16 46 30.8957757413 +47 12 58.631176843           ~ 1 0
27 2MASS J16463345+4741560 * 16 46 33.4525195731 +47 41 55.966884238           ~ 1 0
28 2MASS J16463660+4745098 * 16 46 36.5925992459 +47 45 09.780925669           ~ 1 0
29 2MASS J16464036+4735195 * 16 46 40.3644763817 +47 35 19.501911281           ~ 1 0
30 2MASS J16464167+4730049 * 16 46 41.6739103365 +47 30 05.011729915           ~ 1 0
31 2MASS J16464310+4731033 * 16 46 43.0994944708 +47 31 03.393231893           ~ 4 0
32 2MASS J16464816+4750080 * 16 46 48.1574981926 +47 50 08.063274589           ~ 1 0
33 2MASS J16465059+4725208 * 16 46 50.5979079931 +47 25 20.972163226           ~ 1 0
34 2MASS J16465095+4731163 * 16 46 50.9421086161 +47 31 16.345085949           ~ 1 0
35 2MASS J16465290+4728328 * 16 46 52.8982780569 +47 28 32.848857649           ~ 1 0
36 2MASS J16465319+4732413 * 16 46 53.1835885310 +47 32 41.381410349           ~ 1 0
37 Cl* NGC 6229 CFT 4 * 16 46 53.6236885626 +47 30 22.305432366   17.39 16.31     ~ 4 0
38 2MASS J16465422+4733371 LP* 16 46 54.2201130786 +47 33 37.127089225     15.180   13.550 ~ 2 0
39 2MASS J16465487+4727249 * 16 46 54.8680153217 +47 27 24.992318472           ~ 1 0
40 2MASS J16465515+4731485 * 16 46 55.1449661102 +47 31 48.601442407           ~ 1 0
41 2MASS J16465601+4730407 * 16 46 56.0067780299 +47 30 40.683161279           ~ 1 0
42 Cl* NGC 6229 ZINN 3021 * 16 46 57.6203194851 +47 32 29.664741539   17.14 15.93     ~ 2 0
43 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 315 0
44 2MASS J16470094+4731065 * 16 47 00.9264255672 +47 31 06.710675697           ~ 1 0
45 UCAC4 688-058802 Pe* 16 47 02.0832941896 +47 33 16.343277582   17.18 15.96     ~ 6 0
46 2MASS J16470246+4726234 * 16 47 02.4601994890 +47 26 23.376359624           ~ 1 0
47 2MASS J16470289+4732471 * 16 47 02.8768194712 +47 32 47.139954657           ~ 1 0
48 2MASS J16470381+4746477 * 16 47 03.7992290398 +47 46 47.809749470           ~ 1 0
49 2MASS J16470403+4731201 * 16 47 04.0198999019 +47 31 20.207763890           ~ 1 0
50 2MASS J16470431+4734268 * 16 47 04.2963393707 +47 34 26.895599061           ~ 1 0
51 2MASS J16470843+4744032 * 16 47 08.4237038903 +47 44 03.243157953           ~ 1 0
52 2MASS J16470931+4736507 * 16 47 09.3054935990 +47 36 50.819422670           ~ 1 0
53 2MASS J16471104+4728244 * 16 47 11.0345387051 +47 28 24.442204927           ~ 1 0
54 2MASS J16471253+4720264 * 16 47 12.5185215274 +47 20 26.481973703           ~ 1 0
55 Cl* NGC 6229 ZINN 1009 * 16 47 13.0704097676 +47 32 43.063788222   17.11 15.84     ~ 5 0
56 2MASS J16471359+4734059 * 16 47 13.5818432812 +47 34 05.992263197           ~ 1 0
57 2MASS J16471388+4735472 * 16 47 13.8692518221 +47 35 47.258684738           ~ 1 0
58 2MASS J16471626+4733136 * 16 47 16.2521179591 +47 33 13.694008945           ~ 1 0
59 2MASS J16472007+4729363 RG* 16 47 20.0617326948 +47 29 36.327220514           ~ 3 0
60 2MASS J16472079+4731478 * 16 47 20.7817802299 +47 31 47.898333616           ~ 1 0
61 2MASS J16472302+4737244 * 16 47 23.0184546880 +47 37 24.686764627           ~ 1 0
62 2MASS J16472581+4732161 * 16 47 25.8037352758 +47 32 16.151418119           ~ 1 0
63 2MASS J16473405+4744203 * 16 47 34.0427619019 +47 44 20.434495992           ~ 1 0
64 2MASS J16473678+4723058 * 16 47 36.7720489625 +47 23 05.768813325           ~ 1 0
65 2MASS J16473751+4733136 * 16 47 37.4981684292 +47 33 13.688624419           ~ 1 0
66 2MASS J16480524+4728377 * 16 48 05.2385329923 +47 28 37.760929569           ~ 1 0
67 2MASS J16481312+4731205 * 16 48 13.1210665891 +47 31 20.535351108           ~ 1 0
68 2MASS J16482177+4717330 * 16 48 21.7596745510 +47 17 32.930051768           ~ 1 0
69 2MASS J16482482+4718547 * 16 48 24.8174067316 +47 18 54.688886946           ~ 1 0
70 2MASS J16484573+4736346 * 16 48 45.7259703610 +47 36 34.702688767           ~ 1 0
71 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 309 1
72 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1228 0
73 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1778 2
74 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 914 0
75 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 432 0
76 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 364 0
77 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 316 0
78 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 486 0
79 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 906 1
80 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 453 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-21:55:21

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